One person runs a labyrinth, pursued by a creeping darkness. (not implemented:the other tries to help them with a limited vocabulary and a god's eye view.)
jMonkeyEngine3; could have released as applet, but don't have anywhere to host it.
Extract the zip. Run the .jar file.
edit:I tested this on my home computer and there an issue with the shadow processor. May be related to ATI cards. It looked pretty horrible.
second edit: The shadows are fixed with the catalyst 14.1 beta drivers.