Xtris is another multiplayer Tetris for X. Its neat feature is that it has bot players so that you don't need a human to play head to head tetris. In fun mode, filling more than one row on your board causes that many random-filled rows to appear at the bottom of your opponent's screen. Filling only one row puts a gray square at the top of your opponent's highest column. There's also a chat feature for talking to your opponent (if you have time to take your hands away from the keys). It's a lot a fun, even playing against the bot.

License: free