Galaga '90

Galaga '88 is a fixed shooter video game. Its plot involves the launch of a starship named the Blast Fighter to destroy the hostile Galaga forces and their home planet. Its gameplay is similar to its predecessors; as the Blast Fighter, the player must shoot each of the Galaga aliens, who fly into formation from the top and sides of the playfield. Aliens will make an attempt to hit the player by divebombing towards the bottom of the screen.

Colliding with an alien or their projectile results in a life being lost. Atop each formation are four larger enemies known as the Boss Galaga, which take two hits to destroy. These aliens use a tractor beam to capture a player's ship, returning with it to the top of the screen. The player can reclaim the captured fighter by shooting a Boss Galaga holding one while it is divebombing.

If they are successful, the captured fighter joins with the player's own to create a dual fighter that has additional firepower and a larger hitbox. A Boss Galaga can also capture a dual fighter; rescuing it in the same fashion instead creates a triple fighter, an even larger ship with wide, fast-moving shots. A triple fighter can also be acquired by finding pink-colored capsules. Galaga '88 consists of five "worlds", each one containing up to four stages, including a bonus stage at the end.

Each world gives the player a chance to acquire up to two blue warp capsules by defeating large enemies and destroying obstacles; completing a bonus stage with two capsules warps the player to the next dimension, in which enemies and formations are different and generally more difficult. There are additionally two vertical-scrolling stages featuring two enemy formations and a boss. The game features four different endings based on which dimension the player is in when they complete the game.