[Dr. Boogie]

The idea is that you're a monster and people get through into your water pit. You navigate by sound alone, listening for the victim's breathing. When you get close enough, you can feel their heart beating, at which point you press a button and devour them. More advanced victims need to be crept up on or else they'll dart over to elsewhere in the pit.

I've only got an ok 2-speaker system setup. I'm sure it's a lot more fun with surround sound.