Battle Tetris
Tetris for 2-players.

Black and White Tetris
Fast-loading Java applet.

Blocks
Fun applet with colored blocks on a black background.

Blocks
Same game on a Pakistani server.

Cobs
Creature-feature tetris.

Godmar Back's Tetris
Quick to download and great to play, the pieces here zip right across the screen when you want them to. Good background music.

Javascript Tetris
Works with Netscape 4 or IE 4.

"Just Another Tetris"
3d tetris game, very much like the video game "Welltris" where it looks like your pieces are going down a well, and you move them around the four interior sides.

Tetris
A black-and-white plain Java tetris applet.

Tetris
Run off an Australian server.