This game combines elements from classic games Space Invaders and Defender. Control a cannon at the bottom of the screen to defend humans and the cannon itself against wave after wave of invaders from space, and try to set a new high-score. Certain types of invaders may drop bonus objects when killed. Controls: use the left/right arrow keys to move, the space bar to shoot, the up/down arrow keys to move humans, and the End or Enter key to launch a super-bomb.