3”, where one player has three planes while the other has a single large plane. 2” level – both players have two planes each that move and shoot together – and level 20 is “1 vs. Levels 15 and 19 use guided missiles 16 and 20 use straight missiles on 17 and 18, the players use rapid-fire machine guns. 15-20: Biplane levels, where the players fly planes that are constantly moving forward and wrap around to the other side when they fly off the screen.Levels 13 and 14 use the “billiard hit” rule. Both of these give the players guided missiles. 10 and 11: Invisible tank levels, where the tanks only become briefly visible when they shoot, bump into a wall, or are hit by a missile.In the “billiard hit” levels (8 and 9), there’s an additional rule that a missile must bounce at least once before it can hit the enemy tank. 6-9: “Tank-pong” levels, where the players’ missiles bounce off walls.On the “guided missile” levels (1, 2, 4) the projectiles can be controlled with a joystick after firing. Levels 3 and 5 are “straight missile” levels where the players’ projectiles simply fly forward. All games have a time limit of 136 seconds. The Atari 2600 difficulty settings can be used to change the range of a player’s missiles, as well as the speed of one’s airplanes in levels 15-27. On the tank levels, the players have a selection of two different mazes or no walls at all, while on the plane levels, the players can choose to play with clouds that obscure part of the screen. The game contains 27 levels, each of which has different rules and playing field layout. Hitting the enemy vehicle pushes it back and gives the player one point.
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