Link: http://www.binaryzoo.com/games/echoes/index.htm

This game is similar to the classic game Asteroids, but better:
"Yeah, it's a bit like Asteroids hyperactive, drug crazed brother displayed in blur-o-vision© and viewed through psychedelic sunglasses in a cheap nightclub."

http://www.binaryzoostudios.dreamhosters.com/games/echoes/echoes.zip

Link: http://www.tqworld.com/

Unique game play and music depending on how you are playing. Subconsciously synchronize your brain using video and audio patterns to calm your mind. From the site, "most players experiencing a relaxed euphoria, a feeling of contentment and deep spatial dislocation.".

The soundtrack and game respond to your mouse movements, positively reinforcing you for slow and calm mouse movements with stimulating music and color patterns.

Download here:
http://www.tqworld.com/tranquilityWIN.exe