Anyone play the falling sand game? Sounds stupid but it will definately waste some of your time
. Basically there's all these different elements (sand,oil,wax,water,plant,fire,etc...) and they all interact with each other in some way; up to you to experiement. Be creative and see what you can make!. There are even 'mods' like hell of sand where they add zombies which you can burn or w/e the hell you want to do with them. Post some screenies up if you make something cool!
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I will post some screens later when I get home.
***In the downloadable version; you can load any type of photo file (jpeg) and see what happens