Polaris is a fixed shooter video game released in arcades in 1980 by Taito. Players control a submarine which can only shoot missiles upward. The goal of the player is to destroy all of the airplanes in each level while avoiding bombs dropped from the aircraft, as well as mines launched by enemy submarines and depth charges dropped from boats that speed by. Versions for the Atari 2600 and VIC-20 were released by Tigervision in 1983. Gameplay Subs are sunk if players touch a projectile, any enemy sub or boat, depth charge, mine, the ocean floor, torpedoes, or reef. Game ends upon last sub sunk. Small airplane: Depending on which level the player is on, there will be six to ten small aircraft in the air when the level begins. One half of the aircraft are pink and move right to left, and the other half are blue and move from left to right. These planes drop bombs (which can be shot at and destroyed), and "wrap around" (when they reach one side of the screen, they reappear on the other). The small aircraft also move at different speeds according to how many of the same color aircraft have already been destroyed. For example, a pink plane will move slowest when all pink planes are intact, and will move fastest when it is the only one remaining. Large airplane: This aircraft appears after all of the small aircraft have been destroyed. Unlike the small aircraft, the large aircraft moves in a complicated pattern, moving all across the sky and performing loops as it drops homing missiles. These missiles drop vertically until they are on the same elevation as the player's submarine, then they move horizontally towards it. These missiles cannot be destroyed. Destroying the large aircraft ends the level. Submarine: The enemy submarine periodically shoots an indestructible red mine upward and moves from left to right along the bottom of the screen. Most submarines can be destroyed by moving under then and shooting a missile upward, but in each level there is one submarine which lies close to the ocean floor and cannot be destroyed. In later levels, a smaller white submarine appears which also cannot be destroyed. Like the small planes, the submarine "wraps around" when it reaches the side of the screen. Boat: A yellow boat moves across the surface of the water, alternating from left to right