Tunnel Terror

In Tunnel Terror, you control a small spaceship, which circles around a series of increasingly more complicated dimensional tunnels. Alien space vessels attempt to climb out of the center point of the tunnel, and the player has to avoid enemy ships and fire. The player destroys enemy vessels by firing their fission torpedoes towards the center of the tunnel. The ship can move in a clockwise and counterclockwise direction. There are a total of 61 stages of difficulty.

The player has a total of 3 lives, and when all are lost, it's game over.