Star Guards

Star Guards is a multi-directional shooter arcade game that was released by Bally Midway in 1987. The players must use two eight-way joysticks (one for moving, and one for firing) to take control of three Transformer-like robots (who are coloured as red, yellow and blue respectively). They can fly anywhere they want (and must collect energy, to keep their strength up) - but their objective is to destroy the most "leaders" on each star to conquer it, for once they have conquered four stars they will gain a new weapon (and name). They start out as Flux (who has a magnet as a special weapon), then turn to Tangent (who has a shield), followed by Rebound (who has a boomerang), Kelvin (who has a freeze ray) and Blitz (who has heat-seeking grenades). The player who conquers in the current star will also get to choose the next one on the overworld map.