Alien Addition

The Good
Colorful graphics You can control various aspects of the difficulty (problems can use numbers up to 3, 6, or 9, and you have various speeds you can set).

The Bad
No music/basic sound effects You have to type the correct answers, making this almost as much a typing game as a math game.

The Bottom Line
As alien saucers with addition problems on them descend from above, you have to move your canon, type the answer to the problem, and fire at them to destroy them.