Torpedo Alley players control a shore battery at the bottom of the screen and shoot at an invading fleet of ships above them.
Each hit ship is worth a different amount of points, with the lowest ship being worth 1 point, the middle ship worth 3 points, and the highest ship worth 5 points. The game ends when a player reaches 99 points or the adjustable time limit expires.
This naval battle game is largely inspired by arcade game Sea Worlf.
The field consists of two guns--lower left and right screen; a field of mines--center screen and 3 rows of ships moving across the screen. The bottom row of ships is moving the fastest, the middle row slower and the top row the slowest.