Muhahahahaaa
I think there's an interesting idea here of multiplayer games with highly limited expression, but with some need for them to communicate through whatever limited means.
We need to build, not destroy!
During the time playing with you ended up going from newbie-ooh break stuff/fight to - hey it looks like someone is trying to build something, hmm hey we can help.
At which point you realize that all the blocks couldn't possibly fix perfectly, and a new comer enters the room and his/her cycle begins anew.
This would make a good Turing test.
