Here's my entry. My idea was to try do audio only navigation. You can certainly try that with a pair of headphones. It takes advantage of the stereo sound, so that you can try to understand what is around you without actually seeing. However, there is also a visual element to the game that I used for debugging, and I included a "cheat" checkbox so you can actually reveal what the level looks like.

I look forward to seeing everyone's entries!

-Shane

p.s. I used Mathematica, which requires downloading Mathematica Player 7, which is located here:

http://www.wolfram.com/products/player/