diff --git a/game.html b/game.html
index 356b74b..37c56fa 100644
--- a/game.html
+++ b/game.html
@@ -15,7 +15,7 @@
 			<button id="set_head">Calibrate neutral position</button>
 			<p id="log"></p>
 		</div>
-		<button id="start">Start</button>
+		<button id="start" disabled>Start</button>
 
 		<script src="/three.min.js"></script>
 		<script  src="/game.js"></script>
diff --git a/game.js b/game.js
index 4b15674..d7637b7 100644
--- a/game.js
+++ b/game.js
@@ -136,6 +136,8 @@ function init_gn() {
 		start_gn();
 	}).catch(function(e) {
 		console.error(e);
+		document.getElementById("set_head").remove();
+		document.getElementById("start").disabled = false;
 	});
 
 	document.addEventListener('keydown', e => {
@@ -187,7 +189,9 @@ function set_head_gn() {
 }
 
 document.getElementById("set_head").addEventListener("click", () => {
+	document.getElementById("set_head").remove();
 	set_head_gn();
+	document.getElementById("start").disabled = false;
 });
 
 init_gn();
@@ -252,6 +256,12 @@ init();
 animate();
 
 document.getElementById("start").onclick = () => {
+	try {
+		document.body.requestFullscreen();
+	} catch (e) {
+		// browser doesn't support this API, try another hack
+		window.scrollTo(0,1);
+	}
 	document.getElementById("start").style.zIndex = -10;
 	document.getElementById("start").style.visibility = "hidden";
 	speed = 5.0;