(stylized as Goodbye, Galaxy!) a two-part episodic side-scrolling platform video game developed by id Software and published by Apogee Software in 1991 for DOS.
a three-part episodic side-scrolling platform video game developed by Ideas from the Deep (a precursor to id Software) and published by Apogee Software in 1990 for MS-DOS.
(stylized as Aliens Ate My Babysitter!) a side-scrolling platform video game developed by id Software and published by FormGen in December 1991 for DOS.