Game for Physics - 99 Bricks

How often does a teacher encourages you to play games? But here I am, recommending this brilliant online flash game called 99 Bricks.

It's essentially Tetris with a twist: the aim is to build the TALLEST structure! However, the bricks observe the laws of stability, momentum, balance of moments, forces due to weight and centre of gravity etc etc....

Link: http://www.kongregate.com/games/WeirdBeardGames/99-bricks