Not Tetris

Oh Crap! But it's okay, we can still win this! Maybe ... hopefully ... oh, who are we kidding?

Created in 2010 by the fellows of StabYourself.net, and is now in its second incarnation, Not Tetris is ... well, not your average Tetris clone. Sure, it looks like Tetris, and it sounds like Tetris, but it also incorporates a full Physics Engine: Pieces can move and spin freely in a full 360 degrees, and if it lands at an angle it will tilt and fall over, making the pile difficult to stack in an orderly fashion, and even more difficult to clear a line -- it's almost impossible to play like standard Tetris.

The game is available for free under an open-source license.

Tropes used in Not Tetris include:

• Endless Game: Much like the original Tetris, Not Tetris 2's standard mode proceeds until the board is filled and the player loses. "Stack" mode prevents lines from being cleared, but scores the player on how many pieces they can stack before filling the board.
• Nintendo Hard: The addition of physics make it much tougher to successfully clear lines in an organized manner when compared to the original game.