building sandbox

A playground, based on Sevo's public school (who did the swing) and Chamaedrys wooden tower. Please post comments in my tread.

I was wondering if there's a game out there that allows for great architectural solutions, like Minecraft, but at the same time is not tied to a platform to be run or loaded? This eliminates great titles like Space Engineers because this game requires Steam to run. I hope there's something out...