O.D.T. - Escape...Or Die Trying, is a video game created by Psygnosis for the PlayStation and Microsoft Windows. It is a 3D action-adventure, with some role-playing elements. Playing as 1 of 6 characters, the goal is to explore the "Forbidden Zone" to look for gas canisters to re-inflate one's balloon, which had crashed on the roof of a mysterious tower. Along the way puzzles are solved, monsters are fought, and so on. An N64 version was completed but never released, though it has since been leaked online.

Oddworld: Abe's Oddysee is a platform video game developed by Oddworld Inhabitants and published by GT Interactive. It was released in 1997 for the PlayStation video game console, MS-DOS and Microsoft Windows in North America, Australia and Europe. The game was released under the title Abe a GoGo (エイブ・ア・ゴーゴー Eibu A Gōgō) in Japan for the PlayStation by publisher SoftBank, with a PC version following in 2001. The Game Boy version of Abe's Oddysee, retitled as Oddworld Adventures, was developed by Saffire Corporation and published by GT Interactive in 1998.The game centers on the titular Abe, a Mudokon slave at the RuptureFarms meat processing factory. When he discovers that he and his fellow Mudokons are to be slaughtered, he decides to escape and liberate as many enslaved Mudokons as he can. The player assumes the role of Abe as he attempts a perilous quest to emancipate his downtrodden people.Oddworld: Abe's Oddysee was widely acclaimed for having innovative gameplay, good art direction and engaging cut-scenes; however, its steep learning curve and system of saving only at checkpoints, received criticism. It was the first game in the planned five-part Oddworld series, which also includes its direct sequels, Oddworld: Abe's Exoddus, Oddworld: Munch's Oddysee and Oddworld: Stranger's Wrath. A remake titled Oddworld: New 'n' Tasty! was developed by Just Add Water and released through digital distribution in 2014.

Ogre Battle: The March of the Black Queen (伝説のオウガバトル Densetsu no Ōga Batoru, "Legendary Ogre Battle") is a real-time tactical role-playing video game developed by Quest and released in 1993, and in 1995 in North America as the first installment of the Ogre Battle series. It was directed by Yasumi Matsuno and designed by Matsuno and Akihiko Yoshida. The story of Ogre Battle focuses on a band of rebels as they lead a revolution against a corrupt reigning Empire, ruled by an evil Empress.Ogre Battle was ported to the Sega Saturn and PlayStation, with enhancements made to the original gameplay. It was later released for Virtual Console, and mobile phones. A successor, titled Tactics Ogre: Let Us Cling Together, was released in Japan in 1995 for the Super Famicom.Critical reception to Ogre Battle has been positive; critics have generally praised its gameplay, graphics, and in-depth storyline. The game is also noted for its difficulty, with many reviewers describing the game's desirable good endings as being one of the true challenges in the game.

Omega Boost is a three dimensional shoot 'em up developed by Polyphony Digital for the Sony PlayStation. It was released in 1999 throughout Japan, North America, and Europe by Sony Computer Entertainment.The game features mecha designs by Shoji Kawamori of Macross fame.Being released late in the PlayStation's life, Omega Boost is said to have some of the best graphics on the console with parts of the game running at 60 frame/s. The game was criticized by some reviewers for being too short (Nine levels with nine unlockable special missions) and simplistic. However, it is still considered one of the best Macross-style mecha simulation games produced and is thought of by many as a sleeper hit due to its poor marketing.

One Piece Mansion (ワンピースマンション Wan Piisu Manshon) is a strategy video game that was developed and published by Capcom for the PlayStation in 2001. It is unrelated to the popular anime and manga series One Piece.

OverBlood is a science fiction video game developed by Riverhillsoft and published by Electronic Arts for the PlayStation. It is considered one of the first survival horror games to make use of a fully three-dimensional virtual environment, second only to Riverhillsoft's own Doctor Hauzer, a fully 3D survival horror game released for the 3DO in 1994. The game was later made available on the Japanese PlayStation Network Store.