This game is a successor to the Atari game Combat (1977), at least the part where it's a 2-person tank shooter. However, it's closer in actual play to the Namco games that followed, Tank Battalion (1980) and Battle City (1985). In single player, you kill incoming enemy tanks before they can destroy your base or you run out of lives. Movement is via the arrows, and space is fire. There's assorted power ups that may appear (often in walls) as play continues. Second player uses FSEC+Shift to fire.