Triclops Invasion

The solar system has bee invaded by the Triclops who parachute their giant walkers down to Earth. The only way to destroy a walker is to shoot off one of its three legs but as it has a cannon turret on its top the game's documentation suggests that destroying that first could be a good strategy. Once all five walkers and their satellite the game is won, if the Triclops destroy all three of the player's ships the Earth is lost.