diff --git a/public/game.html b/public/game.html
index 7df2144..b161c26 100644
--- a/public/game.html
+++ b/public/game.html
@@ -320,7 +320,13 @@
             const title = (cardObj && (cardObj.title || cardObj.cardId)) || (played && played.card && (played.card.title || played.card.cardId)) || 'Carte';
             // show player's color instead of their id; fallback to generic label
             const actor = (owner === myPlayerId) ? 'Vous' : (playerColors[owner] ? playerColors[owner] : 'Adversaire');
-            appendActivity(`${actor} : a joué la carte "${title}"`);
+              // If the played card is marked hidden, do not reveal the title to other players
+              const isHidden = (cardObj && cardObj.hidden) || (played && played.card && played.card.hidden);
+              if(isHidden && owner !== myPlayerId){
+                appendActivity(`${actor} : a joué une carte`);
+              } else {
+                appendActivity(`${actor} : a joué la carte "${title}"`);
+              }
           }catch(_){ }
         }catch(e){ console.warn('card:played handler error', e); }
       });
diff --git a/server.js b/server.js
index 14717c6..466644b 100644
--- a/server.js
+++ b/server.js
@@ -305,7 +305,9 @@ function buildDefaultDeck(){
     const cardId = ascii.replace(/[^a-z0-9]+/gi,'_').toLowerCase();
     // Use deterministic id equal to the slug so clients and server agree on identifiers across requests
     const id = cardId;
-    return { id, cardId, title: cap(normalized), description: desc };
+    // mark some cards as hidden so their play isn't revealed publicly (mines, totems, immunities)
+    const hidden = /mine|totem|immun/i.test(cardId);
+    return { id, cardId, title: cap(normalized), description: desc, hidden: !!hidden };
   });
 }