diff --git a/quiz.js b/quiz.js
index 16c1f03..38eec96 100644
--- a/quiz.js
+++ b/quiz.js
@@ -428,6 +428,24 @@ function switchToGame() {
     };
     timer.set(TIMER_QUESTION, timeout);
 
+    var activatePlayer = function(player) {
+	if (activePlayer !== null)
+	    return;
+
+        if (playerNames[player]) {
+	    activePlayer = player;
+	    updateTier();
+	    timer.set(TIMER_ANSWER, timeout);
+	}
+	for(var i = 0; i < playerNames.length; i++) {
+	    sendToBackend({ buzzerLED: [i, i === player ? 1 : 0] });
+	}
+	sendToBackend({ buzzerLED: [player, 1] });
+    };
+    for(var i = 0; i < playerNames.length; i++) {
+	sendToBackend({ buzzerLED: [i, 1] });
+    }
+
     keyHandler = function(key, keyCode) {
         if (keyCode === 27) {
             // Shortcut: cancel this state
@@ -437,11 +455,7 @@ function switchToGame() {
 		   PLAYER_KEYS.indexOf(key) >= 0) {
             // No active player before, but somebody hit a button!
             var player = PLAYER_KEYS.indexOf(key);
-            if (playerNames[player]) {
-                activePlayer = player;
-		updateTier();
-		timer.set(TIMER_ANSWER, timeout);
-	    }
+	    activatePlayer(player);
         } else if (activePlayer !== null &&
                    ANSWER_KEYS.indexOf(key) >= 0) {
             // player pronounced the answer
@@ -474,6 +488,11 @@ function switchToGame() {
 	}
     };
 
+    onBackendMessage = function(msg) {
+	if (msg.buzzer)
+	    activatePlayer(msg.buzzer);
+    };
+
     $('#nedap').hide();
     $('#irc').hide();
     onBackendMessage = null;
diff --git a/server.js b/server.js
index b07e61a..10a3fad 100644
--- a/server.js
+++ b/server.js
@@ -91,6 +91,14 @@ function pushIrcInfo() {
 }
 
 
+/*
+ * Buttons
+ */
+var buzz = new (require('./buzz_iface/node_lib/buzz').Buzz)('/dev/ttyUSB0');
+buzz.on('button', function(key) {
+    sendToFrontend({ buzzer: key });
+});
+
 /*
  * Web server
  */
@@ -125,9 +133,10 @@ wss.createServer({ server: server }).on('connection', function(conn) {
 	    if (msg.nedap) {
 		console.log({ toNedap: msg.nedap });
 		nedap.send(JSON.stringify(msg.nedap));
-	    }
-	    else if (msg.irc === "activate") {
+	    } else if (msg.irc === "activate") {
 		pushIrcInfo();
+	    } else if (msg.buzzerLED) {
+		buzz.set_led(msg.buzzerLED[0], msg.buzzerLED[1]);
 	    }
 	} catch (e) {
 	    console.error(e.stack);