diff --git a/js/game.js b/js/game.js
index 0b0117e..b4e9389 100644
--- a/js/game.js
+++ b/js/game.js
@@ -59,16 +59,16 @@ var reset = function () {
 
 // Update game objects
 var update = function (modifier) {
-	if (38 in keysDown) { // Player holding up
+	if (38 in keysDown && hero.y > 0) { // Player holding up
 		hero.y -= hero.speed * modifier;
 	}
-	if (40 in keysDown) { // Player holding down
+	if (40 in keysDown && hero.y < canvas.height - 32) { // Player holding down
 		hero.y += hero.speed * modifier;
 	}
-	if (37 in keysDown) { // Player holding left
+	if (37 in keysDown && hero.x > 0) { // Player holding left
 		hero.x -= hero.speed * modifier;
 	}
-	if (39 in keysDown) { // Player holding right
+	if (39 in keysDown && hero.x < canvas.width - 32) { // Player holding right
 		hero.x += hero.speed * modifier;
 	}