Brick physics.
But with brick physics, they'd likely all just fall over on their own, the moment they're fake-killed.
And Physics is client-sided, so, if the two players were to press the thing too fast, they'd only see their move.
Jenga's too tricky to get to work in Blockland with brick, I believe. :c
The Checkers and similar board games sound fun.
I'd love to see a full size monopoly board, with players jumping around and buying hotels and apartments on spots. :3