Select the order of play, and click Start. Whoever goes first is yellow, the other is brown. Whoever starts places the Cathedral first.

Select your piece with the mouse, and with the Num Lock key on, use keypad arrows to move, 5 to rotate, and the space bar to drop the piece.

This version of the game does not completely follow the rules, since it allows removal of multiple pieces when they are surrounded, but don't blame me, I didn't write it. If you find a more accurate version, let me know.

Don't know how to play? The rules are here.