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Name: Fluid Monkey
Developer: Buzz Monkey Software
Compatibility: Android 2.2 and up
When you need to wind down, sometimes there's nothing better than zoning out with something simple. Fluid Monkey is a candidate for this kind of relaxation. The basic idea is to interact with a pool of liquid -- by using your finger, you can paint, smear color over the screen, or create fluid with different colors, bouncing balls and sparkles.
Pointless, but strangely a lot of fun.
Via: Google Play
Image credit: Google