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...

Operation Bodycount sounds subtle, doesn’t it? Released in 1994, this shooter wastes no time letting you know exactly what it’s about: running around and, well, increas...

There’s a certain audacity in naming a sequel Oh no! More Lemmings, as if the developers knew exactly what they were unleashing upon your already overworked brain. This 1991 ...

Oil Barons takes the glamorous world of oil speculation—yes, glamorous—and turns it into a strategy game that feels like Monopoly went through a midlife crisis. Release...

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...

If Oil Barons is Monopoly with attitude, Oil Imperium is its slightly more serious cousin who read a business textbook once and won’t let you forget it. Released in 1989, thi...

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 It was originally made for platforms like the Apple II, Atari 8-bit, Commodore 64, and MS-DOS, but was la...