TetriStation

From Absolutist:

TetriStation is a pack of 18 different tetris-like games, with different blocks, grids, strategies and logic. This is a real tetris jukebox! Some of the games are the all-time classics, some are completely new and untasted. Get a whole score of games, a dollar apiece! Upgrades are free, as well as online support. All your best results are submitted to the server and take part in the World-wide contest.

The two week's trial period is free. In the registered game: three skill levels of different difficulty, even kids can have fun; 18 different games for every imaginable taste; tune various options to your taste; your best results are saved, and can take part in the Web-contest for top players;
free technical support by e-mail; upgrades to new versions are free for registered users.