Galaga '88/Versions

Sharp X68000
Developed and published directly by Namco for Japan in 1988, meaning that its year matched to its title. Very similar to the original arcade version.

NEC PC-Engine/TurboGrafx-16
Developed and published directly by Namco for Japan in 1988, then the United States in 1989 as Galaga '90.

Sega Game Gear
Developed and published directly by Namco for Japan in 1990, under the name of Galaga '91. Unlike the X68000, its year does not match to its title.