diff --git a/client/app.js b/client/app.js
index a42cc49..3f3ad1f 100644
--- a/client/app.js
+++ b/client/app.js
@@ -3138,6 +3138,24 @@ class GolfGame {
                 `<span class="rule-tag rule-more" title="${tooltip}">+${moreCount} more</span>`;
         }
         this.activeRulesBar.classList.remove('hidden');
+
+        // Update mobile rules indicator
+        const mobileRulesBtn = document.getElementById('mobile-rules-btn');
+        const mobileRulesIcon = document.getElementById('mobile-rules-icon');
+        const mobileRulesContent = document.getElementById('mobile-rules-content');
+        if (mobileRulesBtn && mobileRulesIcon && mobileRulesContent) {
+            const isHouseRules = rules.length > 0;
+            mobileRulesIcon.textContent = isHouseRules ? '!' : 'S';
+            mobileRulesBtn.classList.toggle('house-rules', isHouseRules);
+
+            if (!isHouseRules) {
+                mobileRulesContent.innerHTML = '<div class="mobile-rules-content-list"><span class="rule-tag standard">Standard Rules</span></div>';
+            } else {
+                const tagHtml = (unrankedTag ? '<span class="rule-tag unranked">Unranked</span>' : '') +
+                    rules.map(renderTag).join('');
+                mobileRulesContent.innerHTML = `<div class="mobile-rules-content-list">${tagHtml}</div>`;
+            }
+        }
     }
 
     // V3_14: Map display names to rule keys
diff --git a/client/index.html b/client/index.html
index 07495e0..9b4bf5c 100644
--- a/client/index.html
+++ b/client/index.html
@@ -406,9 +406,16 @@
                 </div>
             </div>
 
+            <!-- Mobile rules drawer -->
+            <div id="rules-drawer" class="side-panel rules-drawer-panel">
+                <h4>Active Rules</h4>
+                <div id="mobile-rules-content"></div>
+            </div>
+
             <!-- Mobile bottom bar (hidden on desktop) -->
             <div id="mobile-bottom-bar">
                 <div class="mobile-round-info">Hole <span id="mobile-current-round">1</span>/<span id="mobile-total-rounds">9</span></div>
+                <button class="mobile-bar-btn mobile-rules-btn" id="mobile-rules-btn" data-drawer="rules-drawer"><span id="mobile-rules-icon">S</span></button>
                 <button class="mobile-bar-btn" data-drawer="standings-panel">Standings</button>
                 <button class="mobile-bar-btn" data-drawer="scoreboard">Scores</button>
                 <button id="mobile-leave-btn" class="mobile-bar-btn mobile-leave-btn">End Game</button>
diff --git a/client/style.css b/client/style.css
index 71199ef..cfdaddb 100644
--- a/client/style.css
+++ b/client/style.css
@@ -5464,6 +5464,59 @@ body.mobile-portrait #mobile-bottom-bar .mobile-bar-btn.active {
     box-shadow: 0 2px 12px rgba(244, 164, 96, 0.4);
 }
 
+/* --- Mobile: Rules indicator button --- */
+body.mobile-portrait #mobile-bottom-bar .mobile-rules-btn {
+    padding: 4px 9px;
+    font-size: 0.77rem;
+    font-weight: 700;
+    min-width: unset;
+    background: rgba(255, 255, 255, 0.1);
+    border: 1px solid rgba(255, 255, 255, 0.15);
+    color: rgba(255, 255, 255, 0.7);
+}
+
+body.mobile-portrait #mobile-bottom-bar .mobile-rules-btn.house-rules {
+    background: rgba(244, 164, 96, 0.25);
+    border-color: rgba(244, 164, 96, 0.4);
+    color: #f4a460;
+}
+
+/* --- Mobile: Rules drawer content --- */
+#rules-drawer {
+    display: none;
+}
+
+body.mobile-portrait #rules-drawer {
+    display: block;
+}
+
+body.mobile-portrait .rules-drawer-panel .mobile-rules-content-list {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 6px;
+    margin-top: 8px;
+}
+
+body.mobile-portrait .rules-drawer-panel .rule-tag {
+    background: rgba(244, 164, 96, 0.3);
+    color: #f4a460;
+    padding: 4px 10px;
+    border-radius: 4px;
+    font-size: 0.8rem;
+    font-weight: 600;
+}
+
+body.mobile-portrait .rules-drawer-panel .rule-tag.standard {
+    background: rgba(255, 255, 255, 0.15);
+    color: rgba(255, 255, 255, 0.7);
+}
+
+body.mobile-portrait .rules-drawer-panel .rule-tag.unranked {
+    background: rgba(220, 80, 80, 0.3);
+    color: #f08080;
+    border: 1px solid rgba(220, 80, 80, 0.4);
+}
+
 /* --- Mobile: Non-game screens --- */
 body.mobile-portrait #lobby-screen {
     padding: 55px 12px 15px;