[Cueball]

"Build game" can be taken a few ways, but I immediately thought of MINECRAFT. It's a little lame, it's a little fruity (what I like to call 'luity'). It's made entirely from blocks (like lego) but it's multiplayer. You can build a lot of cool things, and it has water and all sorts. The physics aren't 100% but they're good none-the-less.

Check it out

~Cueball~