Blockforge is a clone of the classic game Tetris for Mac OS X. You can
customize the playfield, graphics and sounds, themes are made available on the
official homepage.

You have to line up several falling blocks that match in color in order to
remove them before they reach the top of the screen. Additionally to the
classic Tetris-like game play, the game has two additional single-player modes
called “Time attack” and “Turbo”. A two player and multiplayer mode allows
two-player matches on one computer.

Blockforge