Reality Factory

*Temporary Loss of memory*

i know its a bit old but found the unanswerd link, this came up, i dont know hardly any of them but i do know crisis demo, its a demo of a game

for game dev terms it has its own sanbox, an empty area wich you fill, not sure about user created stuff either and then it runs it in the crytek 2 engine, wich is powerful and resource hogger.