I agree with SimonGhoul - on level 2 if the robot stands on the button then the door opens properly and closes as soon as he moves off, but if you slide the ice block onto the button then it makes the sound as if the door is opening but the graphics don't trigger and you can't actually walk through the door to the next level. Using Chrome on Windows. Graphics are amazing and sound is great, but that means nothing if I can't play past the second level.