Abandonware games beginning with letter O sorted by rating

Omnicron Conspiracy (1989, DOS) is a detective adventure wrapped in a cozy sci-fi blanket. You play as a Galactic Patrol agent solving crimes across alien worlds, all rendered in c...

Onslaught (1990, DOS) takes the classic top-down shoot-and-survive formula and injects it with an enthusiasm that borders on reckless. Hordes of enemies sprint at you like they&rsq...

One Must Fall: 2097 is a fighting game released in 1994 by Epic MegaGames. Set in a futuristic world, the game features giant humanoid robots known as HARs (Human-Assisted Robots) ...

A gentle adventure inspired by the animated film, Once Upon a Forest (1995, DOS) delivers an eco-friendly story wrapped in side-scrolling gameplay. You guide three tiny forest crea...

If you’ve ever wanted to command a basketball team without having to actually dribble or break a sweat, Omni Play Basketball (1990, DOS) has your number. The game lets you ma...

Oil's Well is an action-puzzle game released by Sierra On-Line in 1983/84. It was originally made for platforms like the Apple II, Atari 8-bit, Commodore 64, and MS-DOS, but was la...

One-Nil Soccer Manager is a text-based soccer management simulation game that was popular in the late 1980s and early 1990s. It was developed for various home computer systems, inc...

Omega (1989, DOS) is what happens when someone hands you a robot, a wrench, and a thick manual, then says, “Good luck out there.” Instead of piloting a mech, you actual...