Phit is a mixture of Tetris and limbo dancing. You've got to stuff all the blocks under the dotted line in the fewest possible moves.
Spate introduces Tetris to the wonders of simulated physics. The results aren't half as elegant, but still a lot of fun.
Ooh matron. XTET is a more, shall we say, sensuous take on Tetris. Instead of blocks, you must pair off amorous (and oddly contorted) naked people. Watch out for the sound effects.
That third dimension is brilliant, innit. There's nary a gaming genre under the sun that doesn't benefit from its presence, 3D Tetris being no exception.
More simulated physics, but the challenge factor has been booted up several flights of stairs. In 99 Bricks you must build the highest tower you can with Tetris pieces.
The pun in BASTET should become apparent once you've lost a few rounds. The game automatically seeks out the worst possible pieces for your situation. Starting out with seven Z-shapes in a row is common.
The wondrous Blocks Avalanche traps you in what seems to be a giant game of Tetris, the idea being to climb stacks of fallen blocks to evade the acid. Calling the game a Tetris clone is reaching slightly, but we couldn't resist revisiting it.
Calabouco Tetrico is a grisly psychological experiment - how will the player react if you swap the Tetris blocks for bound prisoners being thrown into a pit? That high score doesn't seem quite so praiseworthy.
Tetris Arcade is the odd one out in our cabinet of misfits. It's just Tetris, plus a smattering of power-ups. Ye purists, rejoice!
And here's something for the world's gazillions of online cardsharps. In Tetris Hold 'Em you must line up descending cards into poker hands.