OK. up key/down key modified from _Dragon_MC_'s Gravity sim, only i made it so that the balls hight decreases(entropy, as _Dragon_MC_ said it was in the original project notes), like in real life. note to _Dragon_MC_ srry i use your projects so much, their really good is all. if you dont want me to then tell me. FUTURE MODIFICATIONS:Ill me making a game from this, just check once in a while for it, meanwhile KEEP ON SCRATCHING!