Hahaha, hilariously funny game. I just went to play it without reading any instructions and in level 3 I tried to jump through the hole by jumping up (up arrow) and immidiatelly pressing down arrow to crouch in midair. Imagine my surprise when the brain left the head and was able to moving on its ovn (but the trick was that jumping was needed to move horizontally, but on the oter hand it could clibm on wall - wow). So I am rating all 5 / 5, just audio 4 / 5 (and I am a totally tolerant person).