Additional flip on discard variant - endgame and updated rules.md and new rules page.

README.md

@@ -86,7 +86,10 @@ When a player reveals all 6 cards, others get one final turn. Lowest score wins.
 - `blackjack` - Score of exactly 21 becomes 0
 
 ### Gameplay Options
-- `flip_on_discard` - Must flip a card when discarding from deck
+- `flip_mode` - What happens when discarding from deck:
+  - `never` - Standard (no flip)
+  - `always` - Speed Golf (must flip after discard)
+  - `endgame` - Suspense (optional flip when any player has ≤1 face-down card)
 - `use_jokers` - Add Jokers to deck
 - `eagle_eye` - Paired Jokers score -8 instead of canceling
 

client/app.js

@@ -138,8 +138,13 @@ class GolfGame {
         this.deckRecommendation = document.getElementById('deck-recommendation');
         this.numRoundsSelect = document.getElementById('num-rounds');
         this.initialFlipsSelect = document.getElementById('initial-flips');
-        this.flipOnDiscardCheckbox = document.getElementById('flip-on-discard');
+        this.flipModeSelect = document.getElementById('flip-mode');
         this.knockPenaltyCheckbox = document.getElementById('knock-penalty');
+
+        // Rules screen elements
+        this.rulesScreen = document.getElementById('rules-screen');
+        this.rulesBtn = document.getElementById('rules-btn');
+        this.rulesBackBtn = document.getElementById('rules-back-btn');
         // House Rules - Point Modifiers
         this.superKingsCheckbox = document.getElementById('super-kings');
         this.tenPennyCheckbox = document.getElementById('ten-penny');
@@ -170,6 +175,7 @@ class GolfGame {
         this.discard = document.getElementById('discard');
         this.discardContent = document.getElementById('discard-content');
         this.discardBtn = document.getElementById('discard-btn');
+        this.skipFlipBtn = document.getElementById('skip-flip-btn');
         this.playerCards = document.getElementById('player-cards');
         this.playerArea = this.playerCards.closest('.player-area');
         this.swapAnimation = document.getElementById('swap-animation');
@@ -193,6 +199,7 @@ class GolfGame {
         this.deck.addEventListener('click', () => { this.playSound('card'); this.drawFromDeck(); });
         this.discard.addEventListener('click', () => { this.playSound('card'); this.drawFromDiscard(); });
         this.discardBtn.addEventListener('click', () => { this.playSound('card'); this.discardDrawn(); });
+        this.skipFlipBtn.addEventListener('click', () => { this.playSound('click'); this.skipFlip(); });
         this.nextRoundBtn.addEventListener('click', () => { this.playSound('click'); this.nextRound(); });
         this.newGameBtn.addEventListener('click', () => { this.playSound('click'); this.newGame(); });
         this.addCpuBtn.addEventListener('click', () => { this.playSound('click'); this.showCpuSelect(); });
@@ -236,6 +243,30 @@ class GolfGame {
                 }
             });
         }
+
+        // Rules screen navigation
+        if (this.rulesBtn) {
+            this.rulesBtn.addEventListener('click', () => {
+                this.playSound('click');
+                this.showRulesScreen();
+            });
+        }
+        if (this.rulesBackBtn) {
+            this.rulesBackBtn.addEventListener('click', () => {
+                this.playSound('click');
+                this.showLobby();
+            });
+        }
+    }
+
+    showRulesScreen(scrollToSection = null) {
+        this.showScreen(this.rulesScreen);
+        if (scrollToSection) {
+            const section = document.getElementById(scrollToSection);
+            if (section) {
+                section.scrollIntoView({ behavior: 'smooth' });
+            }
+        }
     }
 
     connect() {
@@ -367,7 +398,12 @@ class GolfGame {
 
             case 'can_flip':
                 this.waitingForFlip = true;
+                this.flipIsOptional = data.optional || false;
+                if (this.flipIsOptional) {
+                    this.showToast('Flip a card or skip', '', 3000);
+                } else {
                     this.showToast('Flip a face-down card', '', 3000);
+                }
                 this.renderGame();
                 break;
 
@@ -450,7 +486,7 @@ class GolfGame {
         const initial_flips = parseInt(this.initialFlipsSelect.value);
 
         // Standard options
-        const flip_on_discard = this.flipOnDiscardCheckbox.checked;
+        const flip_mode = this.flipModeSelect.value;  // "never", "always", or "endgame"
         const knock_penalty = this.knockPenaltyCheckbox.checked;
 
         // Joker mode (radio buttons)
@@ -475,7 +511,7 @@ class GolfGame {
             decks,
             rounds,
             initial_flips,
-            flip_on_discard,
+            flip_mode,
             knock_penalty,
             use_jokers,
             lucky_swing,
@@ -757,6 +793,15 @@ class GolfGame {
     flipCard(position) {
         this.send({ type: 'flip_card', position });
         this.waitingForFlip = false;
+        this.flipIsOptional = false;
+    }
+
+    skipFlip() {
+        if (!this.flipIsOptional) return;
+        this.send({ type: 'skip_flip' });
+        this.waitingForFlip = false;
+        this.flipIsOptional = false;
+        this.hideToast();
     }
 
     // Fire-and-forget animation triggers based on state changes
@@ -1164,6 +1209,9 @@ class GolfGame {
         this.lobbyScreen.classList.remove('active');
         this.waitingScreen.classList.remove('active');
         this.gameScreen.classList.remove('active');
+        if (this.rulesScreen) {
+            this.rulesScreen.classList.remove('active');
+        }
         screen.classList.add('active');
     }
 
@@ -1566,6 +1614,13 @@ class GolfGame {
             this.discardBtn.classList.remove('disabled');
         }
 
+        // Show/hide skip flip button (only when flip is optional in endgame mode)
+        if (this.waitingForFlip && this.flipIsOptional) {
+            this.skipFlipBtn.classList.remove('hidden');
+        } else {
+            this.skipFlipBtn.classList.add('hidden');
+        }
+
         // Update scoreboard panel
         this.updateScorePanel();
     }

client/index.html

@@ -12,6 +12,7 @@
         <div id="lobby-screen" class="screen active">
             <h1>🏌️ Golf</h1>
             <p class="subtitle">6-Card Golf Card Game</p>
+            <button id="rules-btn" class="btn btn-link">View Rules</button>
 
             <div class="form-group">
                 <label for="player-name">Your Name</label>
@@ -99,11 +100,15 @@
                             <div class="options-category">
                                 <h4>Variants</h4>
                                 <div class="checkbox-group">
-                                    <label class="checkbox-label">
+                                    <div class="select-option">
-                                        <input type="checkbox" id="flip-on-discard">
+                                        <label for="flip-mode">Flip on Discard</label>
-                                        <span>Flip on Discard</span>
+                                        <select id="flip-mode">
-                                        <span class="rule-desc">Flip card when discarding from deck</span>
+                                            <option value="never">Standard - No flip after discarding</option>
-                                    </label>
+                                            <option value="always">Speed Golf - MUST flip a card after discarding</option>
+                                            <option value="endgame">Suspense - MAY flip if anyone has 1 or fewer hidden cards</option>
+                                        </select>
+                                        <span class="rule-desc">What happens when you draw from deck and discard</span>
+                                    </div>
                                     <label class="checkbox-label">
                                         <input type="checkbox" id="knock-penalty">
                                         <span>Knock Penalty</span>
@@ -235,6 +240,7 @@
                                             <span id="discard-content"></span>
                                         </div>
                                         <button id="discard-btn" class="btn btn-small hidden">Discard</button>
+                                        <button id="skip-flip-btn" class="btn btn-small btn-secondary hidden">Skip Flip</button>
                                     </div>
                                 </div>
                             </div>
@@ -288,6 +294,202 @@
         </div>
     </div>
 
+        <!-- Rules Screen -->
+        <div id="rules-screen" class="screen">
+            <div class="rules-container">
+                <button id="rules-back-btn" class="btn btn-secondary back-btn">← Back</button>
+                <h1>Game Rules</h1>
+
+                <section id="rules-basic" class="rules-section">
+                    <h2>Basic Rules</h2>
+                    <p><strong>6-Card Golf</strong> is a card game where players try to achieve the <strong>lowest score</strong> over multiple rounds ("holes"). Like golf, lower is better!</p>
+                    <ul>
+                        <li>Each player has <strong>6 cards</strong> arranged in a 2-row by 3-column grid</li>
+                        <li>Most cards start <strong>face-down</strong> (hidden from everyone)</li>
+                        <li>On your turn: <strong>draw one card</strong>, then either <strong>swap it</strong> with one of yours or <strong>discard it</strong></li>
+                        <li>When any player reveals <strong>all 6 of their cards</strong>, everyone else gets <strong>one final turn</strong></li>
+                        <li>After all rounds ("holes") are played, the player with the <strong>lowest total score wins</strong></li>
+                    </ul>
+                </section>
+
+                <section id="rules-card-values" class="rules-section">
+                    <h2>Card Values</h2>
+                    <table class="rules-table">
+                        <thead>
+                            <tr><th>Card</th><th>Points</th><th>Notes</th></tr>
+                        </thead>
+                        <tbody>
+                            <tr><td>Joker</td><td class="value-negative">-2</td><td>Best card! (requires Jokers to be enabled)</td></tr>
+                            <tr><td>2</td><td class="value-negative">-2</td><td>Excellent - gives you negative points!</td></tr>
+                            <tr><td>Ace (A)</td><td class="value-low">1</td><td>Very low and safe</td></tr>
+                            <tr><td>King (K)</td><td class="value-zero">0</td><td>Zero points - great for making pairs!</td></tr>
+                            <tr><td>3 through 10</td><td>Face value</td><td>3=3 pts, 4=4 pts, ..., 10=10 pts</td></tr>
+                            <tr><td>Jack (J), Queen (Q)</td><td class="value-high">10</td><td>High cards - replace these quickly!</td></tr>
+                        </tbody>
+                    </table>
+                </section>
+
+                <section id="rules-pairing" class="rules-section">
+                    <h2>Column Pairing (IMPORTANT!)</h2>
+                    <p><strong>This is the most important rule to understand:</strong></p>
+                    <p>If both cards in a <strong>vertical column</strong> have the <strong>same rank</strong> (like two Kings, or two 7s), that entire column scores <strong>0 points</strong> - regardless of what the cards are worth individually!</p>
+
+                    <div class="rules-example">
+                        <h4>Example:</h4>
+                        <pre>
+Your 6-card grid:
+  Col1  Col2  Col3
+ [K]   [5]   [7]   ← Top row
+ [K]   [3]   [9]   ← Bottom row
+
+Column 1: K + K = PAIR! = 0 points (not 0+0)
+Column 2: 5 + 3 = 8 points
+Column 3: 7 + 9 = 16 points
+
+TOTAL: 0 + 8 + 16 = 24 points</pre>
+                    </div>
+
+                    <p class="rules-warning"><strong>IMPORTANT:</strong> When you pair cards, you get 0 points for that column - even if the cards have negative values! Two 2s paired = 0 points (not -4). Two Jokers paired = 0 points (not -4).</p>
+                </section>
+
+                <section id="rules-turn" class="rules-section">
+                    <h2>Turn Structure (Step by Step)</h2>
+
+                    <h3>Step 1: Draw a Card</h3>
+                    <p>You MUST draw exactly one card. Choose from:</p>
+                    <ul>
+                        <li><strong>The Deck</strong> (face-down pile) - You don't know what you'll get!</li>
+                        <li><strong>The Discard Pile</strong> (face-up pile) - You can see exactly what card you're taking</li>
+                    </ul>
+
+                    <h3>Step 2: Use or Discard the Card</h3>
+
+                    <div class="rules-case">
+                        <h4>If you drew from the DECK:</h4>
+                        <p>You have two options:</p>
+                        <ul>
+                            <li><strong>SWAP:</strong> Replace any one of your 6 cards with the drawn card. The old card goes to the discard pile.</li>
+                            <li><strong>DISCARD:</strong> Put the drawn card directly on the discard pile without using it.</li>
+                        </ul>
+                    </div>
+
+                    <div class="rules-case">
+                        <h4>If you drew from the DISCARD PILE:</h4>
+                        <p>You MUST swap - you cannot put the same card back on the discard pile.</p>
+                    </div>
+                </section>
+
+                <section id="rules-flip-mode" class="rules-section">
+                    <h2>Flip on Discard Rules (3 Modes)</h2>
+                    <p>This setting affects what happens when you draw from the deck and choose to <strong>discard</strong> (not swap):</p>
+
+                    <div class="rules-mode">
+                        <h3>Standard Mode (No Flip)</h3>
+                        <p class="mode-summary">Default setting. Discarding ends your turn immediately.</p>
+                        <p><strong>How it works:</strong> When you draw from the deck and decide not to use it, you simply discard it and your turn is over. Nothing else happens.</p>
+                        <p><strong>Best for:</strong> Traditional gameplay, longer games, maximum hidden information.</p>
+                    </div>
+
+                    <div class="rules-mode">
+                        <h3>Speed Golf Mode (Must Flip)</h3>
+                        <p class="mode-summary">Every discard reveals one of your hidden cards.</p>
+                        <p><strong>How it works:</strong> When you draw from the deck and discard, you MUST also flip over one of your face-down cards. This is mandatory - you cannot skip it.</p>
+                        <p><strong>Why use it:</strong> Games go much faster because more cards get revealed every turn. More information for everyone = more strategic decisions.</p>
+                        <p><strong>Best for:</strong> Quick games, players who like faster-paced action.</p>
+                    </div>
+
+                    <div class="rules-mode">
+                        <h3>Suspense Mode (Optional Flip Near Endgame)</h3>
+                        <p class="mode-summary">Optional flip activates when any player is close to finishing.</p>
+                        <p><strong>How it works:</strong></p>
+                        <ul>
+                            <li>Early in the round: Discarding ends your turn (like Standard mode)</li>
+                            <li><strong>When ANY player has 1 or fewer face-down cards:</strong> After discarding, you MAY choose to flip one of your hidden cards OR skip the flip</li>
+                        </ul>
+                        <p><strong>Why use it:</strong> Creates dramatic tension near the end of rounds. Do you reveal more to try to improve your score, or keep cards hidden to maintain mystery?</p>
+                        <p><strong>Best for:</strong> Players who enjoy dramatic finishes and tough end-game decisions.</p>
+                    </div>
+                </section>
+
+                <section id="rules-house-rules" class="rules-section">
+                    <h2>House Rules (Optional Variants)</h2>
+
+                    <h3>Point Modifiers</h3>
+                    <ul>
+                        <li><strong>Super Kings:</strong> Kings are worth -2 points instead of 0 (makes them even better!)</li>
+                        <li><strong>Ten Penny:</strong> 10s are worth only 1 point instead of 10 (makes 10s less scary)</li>
+                    </ul>
+
+                    <h3>Joker Variants</h3>
+                    <ul>
+                        <li><strong>Standard Jokers:</strong> 2 Jokers per deck, each worth -2 points (paired Jokers = 0 points)</li>
+                        <li><strong>Lucky Swing:</strong> Only 1 Joker in the entire deck, but it's worth -5 points! (Rare and powerful)</li>
+                        <li><strong>Eagle Eye:</strong> Jokers are worth +2 points unpaired, but -4 points when paired (rewards finding both Jokers)</li>
+                    </ul>
+
+                    <h3>Bonuses & Penalties</h3>
+                    <ul>
+                        <li><strong>Knock Penalty:</strong> If you "go out" (reveal all cards first) but DON'T have the lowest score, you get +10 penalty points. Risk vs reward!</li>
+                        <li><strong>Knock Bonus:</strong> Get -5 points (subtracted from your score) for going out first.</li>
+                        <li><strong>Underdog Bonus:</strong> The player with the lowest score each hole gets -3 points.</li>
+                        <li><strong>Tied Shame:</strong> If you tie with another player's score, both of you get +5 penalty points.</li>
+                        <li><strong>Blackjack:</strong> If your exact score is 21, it becomes 0 instead!</li>
+                        <li><strong>Wolfpack:</strong> If you have exactly 2 pairs of Jacks (all 4 Jacks), you get -5 bonus points.</li>
+                    </ul>
+                </section>
+
+                <section id="rules-faq" class="rules-section">
+                    <h2>Frequently Asked Questions</h2>
+
+                    <div class="faq-item">
+                        <h4>Q: Can I look at my face-down cards?</h4>
+                        <p>A: No! Once the game starts, you cannot peek at your own face-down cards. You only see them when they get flipped face-up (either by swapping or by the flip-on-discard rule).</p>
+                    </div>
+
+                    <div class="faq-item">
+                        <h4>Q: Can I swap a face-down card without looking at it first?</h4>
+                        <p>A: Yes! In fact, that's often the best strategy - if you have a card that seems high based on probability, swap it out before you even see it.</p>
+                    </div>
+
+                    <div class="faq-item">
+                        <h4>Q: What happens when someone reveals all their cards?</h4>
+                        <p>A: Once ANY player has all 6 cards face-up, every other player gets exactly ONE more turn. Then the round ends and scores are calculated.</p>
+                    </div>
+
+                    <div class="faq-item">
+                        <h4>Q: Do I have to go out (reveal all cards) to win?</h4>
+                        <p>A: No! You can win the round even with face-down cards. The player with the lowest score wins, regardless of how many cards are revealed.</p>
+                    </div>
+
+                    <div class="faq-item">
+                        <h4>Q: When do pairs count?</h4>
+                        <p>A: Pairs only count in VERTICAL columns (top card + bottom card in the same column). Horizontal or diagonal matches don't create pairs.</p>
+                    </div>
+
+                    <div class="faq-item">
+                        <h4>Q: Can I make a pair with face-down cards?</h4>
+                        <p>A: Face-down cards are still counted for scoring, but since you can't see them, you're gambling that they might form a pair. At the end of the round, all cards are revealed and pairs are calculated.</p>
+                    </div>
+
+                    <div class="faq-item">
+                        <h4>Q: What if the deck runs out of cards?</h4>
+                        <p>A: The discard pile (except the top card) is shuffled to create a new deck.</p>
+                    </div>
+
+                    <div class="faq-item">
+                        <h4>Q: In Suspense mode, when exactly can I flip?</h4>
+                        <p>A: The optional flip activates the moment ANY player (including you) has 1 or fewer face-down cards remaining. From that point until the round ends, whenever you discard from the deck, you'll get the option to flip or skip.</p>
+                    </div>
+
+                    <div class="faq-item">
+                        <h4>Q: Why would I NOT flip in Suspense mode?</h4>
+                        <p>A: Maybe you have a hidden card you hope is good, and you don't want to reveal a potential disaster. Or maybe you want to keep your opponents guessing about your score. It's a strategic choice!</p>
+                    </div>
+                </section>
+            </div>
+        </div>
+    </div>
+
     <!-- CPU Select Modal -->
     <div id="cpu-select-modal" class="modal hidden">
         <div class="modal-content">

client/style.css

@@ -2151,3 +2151,279 @@ input::placeholder {
         padding: 12px 20px;
     }
 }
+
+/* ===========================================
+   RULES SCREEN
+   =========================================== */
+
+#rules-screen {
+    max-width: 800px;
+    margin: 0 auto;
+    padding: 20px;
+}
+
+.rules-container {
+    background: rgba(0, 0, 0, 0.3);
+    border-radius: 12px;
+    padding: 25px 35px;
+    border: 1px solid rgba(255, 255, 255, 0.1);
+}
+
+.rules-container h1 {
+    text-align: center;
+    margin-bottom: 30px;
+    color: #f4a460;
+    font-size: 2rem;
+}
+
+.rules-container .back-btn {
+    margin-bottom: 20px;
+}
+
+.rules-section {
+    margin-bottom: 35px;
+    padding-bottom: 25px;
+    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
+}
+
+.rules-section:last-child {
+    border-bottom: none;
+    margin-bottom: 0;
+}
+
+.rules-section h2 {
+    color: #f4a460;
+    font-size: 1.4rem;
+    margin-bottom: 15px;
+    padding-bottom: 8px;
+    border-bottom: 2px solid rgba(244, 164, 96, 0.3);
+}
+
+.rules-section h3 {
+    color: #e8d8c8;
+    font-size: 1.1rem;
+    margin: 20px 0 10px 0;
+}
+
+.rules-section h4 {
+    color: #d4c4b4;
+    font-size: 1rem;
+    margin: 15px 0 8px 0;
+}
+
+.rules-section p {
+    line-height: 1.7;
+    margin-bottom: 12px;
+    color: rgba(255, 255, 255, 0.9);
+}
+
+.rules-section ul {
+    margin-left: 20px;
+    margin-bottom: 15px;
+}
+
+.rules-section li {
+    line-height: 1.7;
+    margin-bottom: 8px;
+    color: rgba(255, 255, 255, 0.85);
+}
+
+/* Rules table */
+.rules-table {
+    width: 100%;
+    border-collapse: collapse;
+    margin: 15px 0;
+    background: rgba(0, 0, 0, 0.2);
+    border-radius: 8px;
+    overflow: hidden;
+}
+
+.rules-table th,
+.rules-table td {
+    padding: 12px 15px;
+    text-align: left;
+    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
+}
+
+.rules-table th {
+    background: rgba(244, 164, 96, 0.2);
+    color: #f4a460;
+    font-weight: 600;
+}
+
+.rules-table tr:last-child td {
+    border-bottom: none;
+}
+
+.value-negative {
+    color: #4ade80;
+    font-weight: 700;
+}
+
+.value-low {
+    color: #86efac;
+}
+
+.value-zero {
+    color: #fbbf24;
+}
+
+.value-high {
+    color: #f87171;
+    font-weight: 600;
+}
+
+/* Rules example box */
+.rules-example {
+    background: rgba(0, 0, 0, 0.3);
+    border: 1px solid rgba(255, 255, 255, 0.15);
+    border-radius: 8px;
+    padding: 15px 20px;
+    margin: 15px 0;
+}
+
+.rules-example h4 {
+    margin-top: 0;
+    color: #f4a460;
+}
+
+.rules-example pre {
+    font-family: 'Courier New', monospace;
+    font-size: 0.9rem;
+    line-height: 1.5;
+    color: rgba(255, 255, 255, 0.9);
+    white-space: pre-wrap;
+    margin: 0;
+}
+
+.rules-warning {
+    background: rgba(239, 68, 68, 0.15);
+    border: 1px solid rgba(239, 68, 68, 0.3);
+    border-radius: 6px;
+    padding: 12px 15px;
+    color: #fca5a5;
+}
+
+/* Rules case boxes */
+.rules-case {
+    background: rgba(255, 255, 255, 0.05);
+    border-radius: 8px;
+    padding: 15px;
+    margin: 15px 0;
+    border-left: 3px solid rgba(244, 164, 96, 0.5);
+}
+
+.rules-case h4 {
+    margin-top: 0;
+}
+
+/* Flip mode boxes */
+.rules-mode {
+    background: rgba(0, 0, 0, 0.2);
+    border-radius: 10px;
+    padding: 20px;
+    margin: 20px 0;
+    border: 1px solid rgba(255, 255, 255, 0.1);
+}
+
+.rules-mode h3 {
+    margin-top: 0;
+    color: #f4a460;
+}
+
+.mode-summary {
+    background: rgba(244, 164, 96, 0.15);
+    border-radius: 6px;
+    padding: 10px 15px;
+    font-weight: 600;
+    color: #f4a460;
+    margin-bottom: 15px;
+}
+
+/* FAQ items */
+.faq-item {
+    background: rgba(0, 0, 0, 0.2);
+    border-radius: 8px;
+    padding: 15px 20px;
+    margin: 15px 0;
+    border-left: 3px solid #3b82f6;
+}
+
+.faq-item h4 {
+    margin: 0 0 10px 0;
+    color: #93c5fd;
+}
+
+.faq-item p {
+    margin: 0;
+    color: rgba(255, 255, 255, 0.85);
+}
+
+/* Rules link button in lobby */
+.btn-link {
+    background: transparent;
+    border: none;
+    color: #f4a460;
+    text-decoration: underline;
+    cursor: pointer;
+    font-size: 0.95rem;
+    margin-bottom: 15px;
+}
+
+.btn-link:hover {
+    color: #fbbf24;
+}
+
+/* Select option styling in advanced options */
+.select-option {
+    margin-bottom: 12px;
+}
+
+.select-option label {
+    display: block;
+    margin-bottom: 5px;
+    color: #f4a460;
+    font-size: 0.9rem;
+}
+
+.select-option select {
+    width: 100%;
+    padding: 8px 10px;
+    background: rgba(0, 0, 0, 0.3);
+    border: 1px solid rgba(255, 255, 255, 0.2);
+    border-radius: 6px;
+    color: white;
+    font-size: 0.85rem;
+}
+
+.select-option .rule-desc {
+    display: block;
+    margin-top: 4px;
+    font-size: 0.75rem;
+    color: rgba(255, 255, 255, 0.5);
+}
+
+/* Mobile adjustments for rules */
+@media (max-width: 600px) {
+    .rules-container {
+        padding: 20px;
+    }
+
+    .rules-container h1 {
+        font-size: 1.6rem;
+    }
+
+    .rules-section h2 {
+        font-size: 1.2rem;
+    }
+
+    .rules-table th,
+    .rules-table td {
+        padding: 8px 10px;
+        font-size: 0.9rem;
+    }
+
+    .rules-example pre {
+        font-size: 0.8rem;
+    }
+}

server/RULES.md

@@ -260,13 +260,33 @@ Our implementation supports these optional rule variations. All are **disabled b
 | Option | Description | Default |
 |--------|-------------|---------|
 | `initial_flips` | Cards revealed at start (0, 1, or 2) | 2 |
-| `flip_on_discard` | Must flip a card after discarding from deck | Off |
+| `flip_mode` | What happens when discarding from deck (see below) | `never` |
 | `knock_penalty` | +10 if you go out but don't have lowest score | Off |
 | `use_jokers` | Add Jokers to deck (-2 points each) | Off |
 
+### Flip Mode Options
+
+The `flip_mode` setting controls what happens when you draw from the deck and choose to discard (not swap):
+
+| Value | Name | Behavior |
+|-------|------|----------|
+| `never` | **Standard** | No flip when discarding - your turn ends immediately. This is the classic rule. |
+| `always` | **Speed Golf** | Must flip one face-down card when discarding. Accelerates the game by revealing more information each turn. |
+| `endgame` | **Suspense** | May *optionally* flip if any player has ≤1 face-down card. Creates tension near the end of rounds. |
+
+**Standard (never):** When you draw from the deck and choose not to use the card, simply discard it and your turn ends.
+
+**Speed Golf (always):** When you discard from the deck, you must also flip one of your face-down cards. This accelerates the game by revealing more information each turn, leading to faster rounds.
+
+**Suspense (endgame):** When any player has only 1 (or 0) face-down cards remaining, discarding from the deck gives you the *option* to flip a card. This creates tension near the end of rounds - do you reveal more to improve your position, or keep your cards hidden?
+
 | Implementation | File |
 |----------------|------|
 | GameOptions dataclass | `game.py:200-222` |
+| FlipMode enum | `game.py:12-24` |
+| flip_on_discard property | `game.py:449-470` |
+| flip_is_optional property | `game.py:472-479` |
+| skip_flip_and_end_turn() | `game.py:520-540` |
 
 ## Point Modifiers
 
@@ -530,7 +550,11 @@ Draw Phase:
           │   └── Swap at position
           └── choose_swap_or_discard() returns None
               └── Discard drawn card
-                  └── flip_on_discard? -> choose_flip_after_discard()
+                  └── flip_on_discard?
+                      ├── flip_mode="always" -> MUST flip (choose_flip_after_discard)
+                      └── flip_mode="endgame" -> should_skip_optional_flip()?
+                          ├── True -> skip flip, end turn
+                          └── False -> flip (choose_flip_after_discard)
 ```
 
 | Decision Point | Tests |
@@ -737,7 +761,7 @@ Configuration precedence (highest to lowest):
 | `DEFAULT_ROUNDS` | `9` | Rounds per game |
 | `DEFAULT_INITIAL_FLIPS` | `2` | Cards to flip at start |
 | `DEFAULT_USE_JOKERS` | `false` | Enable jokers |
-| `DEFAULT_FLIP_ON_DISCARD` | `false` | Flip after discard |
+| `DEFAULT_FLIP_MODE` | `never` | Flip mode: `never`, `always`, or `endgame` |
 
 ### Security
 

server/ai.py

@@ -820,6 +820,48 @@ class GolfAI:
 
         return random.choice(face_down)
 
+    @staticmethod
+    def should_skip_optional_flip(player: Player, profile: CPUProfile, game: Game) -> bool:
+        """
+        Decide whether to skip the optional flip in endgame mode.
+
+        In endgame (Suspense) mode, the flip is optional. AI should generally
+        flip for information, but may skip if:
+        - Already has good information about their hand
+        - Wants to keep cards hidden for suspense
+        - Random unpredictability factor
+
+        Returns True if AI should skip the flip, False if it should flip.
+        """
+        face_down = [i for i, c in enumerate(player.cards) if not c.face_up]
+
+        if not face_down:
+            return True  # No cards to flip
+
+        # Very conservative players (low aggression) might skip to keep hidden
+        # But information is usually valuable, so mostly flip
+        skip_chance = 0.1  # Base 10% chance to skip
+
+        # More hidden cards = more value in flipping for information
+        if len(face_down) >= 3:
+            skip_chance = 0.05  # Less likely to skip with many hidden cards
+
+        # If only 1 hidden card, we might skip to keep opponents guessing
+        if len(face_down) == 1:
+            skip_chance = 0.2 + (1.0 - profile.aggression) * 0.2
+
+        # Unpredictable players are more random about this
+        skip_chance += profile.unpredictability * 0.15
+
+        ai_log(f"  Optional flip decision: {len(face_down)} face-down cards, skip_chance={skip_chance:.2f}")
+
+        if random.random() < skip_chance:
+            ai_log(f"  >> SKIP: choosing not to flip (endgame mode)")
+            return True
+
+        ai_log(f"  >> FLIP: choosing to reveal for information")
+        return False
+
     @staticmethod
     def should_go_out_early(player: Player, game: Game, profile: CPUProfile) -> bool:
         """
@@ -988,6 +1030,42 @@ async def process_cpu_turn(
             )
 
         if game.flip_on_discard:
+            # Check if flip is optional (endgame mode) and decide whether to skip
+            if game.flip_is_optional:
+                if GolfAI.should_skip_optional_flip(cpu_player, profile, game):
+                    game.skip_flip_and_end_turn(cpu_player.id)
+
+                    # Log skip decision
+                    if logger and game_id:
+                        logger.log_move(
+                            game_id=game_id,
+                            player=cpu_player,
+                            is_cpu=True,
+                            action="skip_flip",
+                            card=None,
+                            game=game,
+                            decision_reason="skipped optional flip (endgame mode)",
+                        )
+                else:
+                    # Choose to flip
+                    flip_pos = GolfAI.choose_flip_after_discard(cpu_player, profile)
+                    game.flip_and_end_turn(cpu_player.id, flip_pos)
+
+                    # Log flip decision
+                    if logger and game_id:
+                        flipped_card = cpu_player.cards[flip_pos]
+                        logger.log_move(
+                            game_id=game_id,
+                            player=cpu_player,
+                            is_cpu=True,
+                            action="flip",
+                            card=flipped_card,
+                            position=flip_pos,
+                            game=game,
+                            decision_reason=f"flipped card at position {flip_pos} (chose to flip in endgame mode)",
+                        )
+            else:
+                # Mandatory flip (always mode)
                 flip_pos = GolfAI.choose_flip_after_discard(cpu_player, profile)
                 game.flip_and_end_turn(cpu_player.id, flip_pos)
 

server/config.py

@@ -99,7 +99,7 @@ class GameDefaults:
     rounds: int = 9
     initial_flips: int = 2
     use_jokers: bool = False
-    flip_on_discard: bool = False
+    flip_mode: str = "never"  # "never", "always", or "endgame"
 
 
 @dataclass
@@ -160,7 +160,7 @@ class ServerConfig:
                 rounds=get_env_int("DEFAULT_ROUNDS", 9),
                 initial_flips=get_env_int("DEFAULT_INITIAL_FLIPS", 2),
                 use_jokers=get_env_bool("DEFAULT_USE_JOKERS", False),
-                flip_on_discard=get_env_bool("DEFAULT_FLIP_ON_DISCARD", False),
+                flip_mode=get_env("DEFAULT_FLIP_MODE", "never"),
             ),
         )
 

server/constants.py

@@ -70,7 +70,7 @@ if _use_config:
     DEFAULT_ROUNDS = config.game_defaults.rounds
     DEFAULT_INITIAL_FLIPS = config.game_defaults.initial_flips
     DEFAULT_USE_JOKERS = config.game_defaults.use_jokers
-    DEFAULT_FLIP_ON_DISCARD = config.game_defaults.flip_on_discard
+    DEFAULT_FLIP_MODE = config.game_defaults.flip_mode
 else:
     MAX_PLAYERS = 6
     ROOM_CODE_LENGTH = 4
@@ -78,7 +78,7 @@ else:
     DEFAULT_ROUNDS = 9
     DEFAULT_INITIAL_FLIPS = 2
     DEFAULT_USE_JOKERS = False
-    DEFAULT_FLIP_ON_DISCARD = False
+    DEFAULT_FLIP_MODE = "never"
 
 
 # =============================================================================

server/game.py

@@ -32,6 +32,20 @@ from constants import (
 )
 
 
+class FlipMode(str, Enum):
+    """
+    Mode for flip-on-discard rule.
+
+    NEVER: No flip when discarding from deck (standard rules)
+    ALWAYS: Must flip when discarding from deck (Speed Golf - faster games)
+    ENDGAME: Optional flip when any player has ≤1 face-down card (Suspense mode)
+    """
+
+    NEVER = "never"
+    ALWAYS = "always"
+    ENDGAME = "endgame"
+
+
 class Suit(Enum):
     """Card suits for a standard deck."""
 
@@ -359,8 +373,8 @@ class GameOptions:
     """
 
     # --- Standard Options ---
-    flip_on_discard: bool = False
+    flip_mode: str = "never"
-    """If True, player must flip a face-down card after discarding from deck."""
+    """Flip mode when discarding from deck: 'never', 'always', or 'endgame'."""
 
     initial_flips: int = 2
     """Number of cards each player reveals at round start (0, 1, or 2)."""
@@ -448,8 +462,32 @@ class Game:
 
     @property
     def flip_on_discard(self) -> bool:
-        """Convenience property for flip_on_discard option."""
+        """
-        return self.options.flip_on_discard
+        Whether current turn requires/allows a flip after discard.
+
+        Returns True if:
+        - flip_mode is 'always' (Speed Golf)
+        - flip_mode is 'endgame' AND any player has ≤1 face-down card (Suspense)
+        """
+        if self.options.flip_mode == FlipMode.ALWAYS.value:
+            return True
+        if self.options.flip_mode == FlipMode.ENDGAME.value:
+            # Check if any player has ≤1 face-down card
+            for player in self.players:
+                face_down_count = sum(1 for c in player.cards if not c.face_up)
+                if face_down_count <= 1:
+                    return True
+            return False
+        return False  # "never"
+
+    @property
+    def flip_is_optional(self) -> bool:
+        """
+        Whether the flip is optional (endgame mode) vs mandatory (always mode).
+
+        In endgame mode, player can choose to skip the flip.
+        """
+        return self.options.flip_mode == FlipMode.ENDGAME.value and self.flip_on_discard
 
     def get_card_values(self) -> dict[str, int]:
         """
@@ -817,6 +855,29 @@ class Game:
         self._check_end_turn(player)
         return True
 
+    def skip_flip_and_end_turn(self, player_id: str) -> bool:
+        """
+        Skip optional flip and end turn (endgame mode only).
+
+        In endgame mode (flip_mode='endgame'), the flip is optional,
+        so players can choose to skip it and end their turn immediately.
+
+        Args:
+            player_id: ID of the player skipping the flip.
+
+        Returns:
+            True if skip was valid and turn ended, False otherwise.
+        """
+        if not self.flip_is_optional:
+            return False
+
+        player = self.current_player()
+        if not player or player.id != player_id:
+            return False
+
+        self._check_end_turn(player)
+        return True
+
     # -------------------------------------------------------------------------
     # Turn & Round Flow (Internal)
     # -------------------------------------------------------------------------
@@ -1002,8 +1063,10 @@ class Game:
         # Build active rules list for display
         active_rules = []
         if self.options:
-            if self.options.flip_on_discard:
+            if self.options.flip_mode == FlipMode.ALWAYS.value:
-                active_rules.append("Flip on Discard")
+                active_rules.append("Speed Golf")
+            elif self.options.flip_mode == FlipMode.ENDGAME.value:
+                active_rules.append("Suspense")
             if self.options.knock_penalty:
                 active_rules.append("Knock Penalty")
             if self.options.use_jokers and not self.options.lucky_swing and not self.options.eagle_eye:
@@ -1043,6 +1106,8 @@ class Game:
             ),
             "initial_flips": self.options.initial_flips,
             "flip_on_discard": self.flip_on_discard,
+            "flip_mode": self.options.flip_mode,
+            "flip_is_optional": self.flip_is_optional,
             "card_values": self.get_card_values(),
             "active_rules": active_rules,
         }

server/game_log.py

@@ -70,7 +70,7 @@ class GameLogger:
         """Log start of a new game. Returns game_id."""
         game_id = str(uuid.uuid4())
         options_dict = {
-            "flip_on_discard": options.flip_on_discard,
+            "flip_mode": options.flip_mode,
             "initial_flips": options.initial_flips,
             "knock_penalty": options.knock_penalty,
             "use_jokers": options.use_jokers,

server/main.py

@@ -560,7 +560,7 @@ async def websocket_endpoint(websocket: WebSocket):
                 # Build game options
                 options = GameOptions(
                     # Standard options
-                    flip_on_discard=data.get("flip_on_discard", False),
+                    flip_mode=data.get("flip_mode", "never"),
                     initial_flips=max(0, min(2, data.get("initial_flips", 2))),
                     knock_penalty=data.get("knock_penalty", False),
                     use_jokers=data.get("use_jokers", False),
@@ -656,18 +656,19 @@ async def websocket_endpoint(websocket: WebSocket):
                     await broadcast_game_state(current_room)
 
                     if current_room.game.flip_on_discard:
-                        # Version 1: Check if player has face-down cards to flip
+                        # Check if player has face-down cards to flip
                         player = current_room.game.get_player(player_id)
                         has_face_down = player and any(not c.face_up for c in player.cards)
 
                         if has_face_down:
                             await websocket.send_json({
                                 "type": "can_flip",
+                                "optional": current_room.game.flip_is_optional,
                             })
                         else:
                             await check_and_run_cpu_turn(current_room)
                     else:
-                        # Version 2 (default): Turn ended, check for CPU
+                        # Turn ended, check for CPU
                         await check_and_run_cpu_turn(current_room)
 
             elif msg_type == "flip_card":
@@ -679,6 +680,14 @@ async def websocket_endpoint(websocket: WebSocket):
                 await broadcast_game_state(current_room)
                 await check_and_run_cpu_turn(current_room)
 
+            elif msg_type == "skip_flip":
+                if not current_room:
+                    continue
+
+                if current_room.game.skip_flip_and_end_turn(player_id):
+                    await broadcast_game_state(current_room)
+                    await check_and_run_cpu_turn(current_room)
+
             elif msg_type == "next_round":
                 if not current_room:
                     continue

server/score_analysis.py

@@ -26,7 +26,7 @@ def run_game_for_scores(num_players: int = 4) -> dict[str, int]:
         game.add_player(player)
         player_profiles[player.id] = profile
 
-    options = GameOptions(initial_flips=2, flip_on_discard=False, use_jokers=False)
+    options = GameOptions(initial_flips=2, flip_mode="never", use_jokers=False)
     game.start_game(num_decks=1, num_rounds=1, options=options)
 
     # Initial flips

server/simulate.py

@@ -412,7 +412,7 @@ def run_simulation(
     # Default options
     options = GameOptions(
         initial_flips=2,
-        flip_on_discard=False,
+        flip_mode="never",
         use_jokers=False,
     )
 
@@ -450,7 +450,7 @@ def run_detailed_game(num_players: int = 4):
 
     options = GameOptions(
         initial_flips=2,
-        flip_on_discard=False,
+        flip_mode="never",
         use_jokers=False,
     )
 

server/test_house_rules.py

@@ -191,25 +191,30 @@ def get_test_configs() -> list[tuple[str, GameOptions]]:
     # Baseline (no house rules)
     configs.append(("BASELINE", GameOptions(
         initial_flips=2,
-        flip_on_discard=False,
+        flip_mode="never",
         use_jokers=False,
     )))
 
     # === Standard Options ===
 
-    configs.append(("flip_on_discard", GameOptions(
+    configs.append(("flip_mode_always", GameOptions(
         initial_flips=2,
-        flip_on_discard=True,
+        flip_mode="always",
+    )))
+
+    configs.append(("flip_mode_endgame", GameOptions(
+        initial_flips=2,
+        flip_mode="endgame",
     )))
 
     configs.append(("initial_flips=0", GameOptions(
         initial_flips=0,
-        flip_on_discard=False,
+        flip_mode="never",
     )))
 
     configs.append(("initial_flips=1", GameOptions(
         initial_flips=1,
-        flip_on_discard=False,
+        flip_mode="never",
     )))
 
     configs.append(("knock_penalty", GameOptions(
@@ -300,13 +305,13 @@ def get_test_configs() -> list[tuple[str, GameOptions]]:
 
     configs.append(("CLASSIC+ (jokers + flip)", GameOptions(
         initial_flips=2,
-        flip_on_discard=True,
+        flip_mode="always",
         use_jokers=True,
     )))
 
     configs.append(("EVERYTHING", GameOptions(
         initial_flips=2,
-        flip_on_discard=True,
+        flip_mode="always",
         knock_penalty=True,
         use_jokers=True,
         lucky_swing=True,
@@ -472,8 +477,8 @@ def print_expected_effects(results: list[RuleTestResult]):
         status = "✓" if diff > 0 else "?"
         checks.append((r.name, expected, f"{actual} ({diff:+.1f})", status))
 
-    # flip_on_discard might slightly lower scores (more info)
+    # flip_mode_always might slightly lower scores (more info)
-    r = find("flip_on_discard")
+    r = find("flip_mode_always")
     if r and r.scores:
         diff = r.mean_score - baseline.mean_score
         expected = "SIMILAR or lower"