A sequel to "Galaxian" - itself an answer to Taito's legendary "Space Invaders" - Galaga improves on its predecessor in a number of ways. The graphics are a little sharper and smoother, for example, but the real improvements are in the game-play. The alien movement patterns are more dynamic than those in Galaxian, with kamikaze dives being not only more frequent, but perceptively more aggressive.

Another new addition to the game-play comes in the form of the 'Tractor Beam'; if the player allows an alien to capture one of their ships in its tractor beam, it's possible to shoot the offending alien, thus releasing the ship, which will then 'dock' alongside the player's current ship and double their firepower. To free the captured ship, the player must destroy the captor Galaga while it is attacking, otherwise the captured ship will be destroyed. This allowed for skilled players to deliberately allow one of their ships to be captured, giving them the opportunity to upgrade their firepower. Ships are lost when hit by enemies, while Dual ships are destroyed individually.

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