CAVEAT: this is not a game but an experimental renderer, a realtime fractal-voxel raytracer. Dev bait only.
if you happen to have a linux box with an i7 or so*, please try this:
hg clone
https://code.google.com/p/xenoxolotl-spasim/ cd xenoxolotl-spasim/
./aos -x XNXLRender.Mod
It wants libGL.so not libGL.so.6 and so on so you might need to make a few symbolic links. If a black window appears it is working.
After a few seconds** it will have built the world and you may see a cursor in the center of the black, or a white screen: this is because the camera spawned inside an object. Hop with 'h' a few times and you will be free. Look in XNXLRender.Mod's KeyEvent procedure for all the keyboard commands.
*the more cores, the more better
**not that few, though