Check out the top rated Action abandonware games, based on user ratings.
Orbitron
Commodore 64
1984
Oriental Games
Amiga, ZX Spectrum, Amstrad CPC, Atari ST
1990
Orion
Acorn 32-bit
1988
Ork Attack: The Return
Amiga
1994
Ortotris
DOS, Commodore 64
1992
OSman
Arcade
1996
Outbreak
Windows
2001
Outlands
Amiga, Atari ST
1989
Outlaw Golf
Windows
2003
Outris
Atari 8-bit
1993
Outtrigger
Arcade
1999
Outzone
Amiga, Atari ST
1991
Overkill
DOS
1996
Overlord
Windows
2007
P-38 Lightning Tour of Duty
DOS
1991
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