TOUS LES LIVRES
- O.D.T - Prima's Official Strategy Guide (1998)
- Obsidian - Strategies & Secrets (1997)
- Ocean - The History (2014)
- Oddworld : Abe's Origins (2019)
- Oddworld : Munch's Oddysee - Prima's Official Strategy Guide (2001)
- Oddworld : Stranger's Wrath - Prima Official Game Guide (2005)
- Oddworld : Abe's Exodus - The Official Strategy Guide (1998)
- Oddworld : Abe's Odyssey - The Official Strategy Guide (1997)
- Oddworld : Abe's Odyssey - The Official Strategy Guide (1997)
- Oddworld : Abe's Odyssey - Totally Unauthorized Guide (1997)
- Of Light and Darkness - The Prophecy - Official Strategies & Secrets (1998)
- Official Mortal Kombat 3 Fighter's Kompanion (1995)
- Official Mortal Kombat 3 Pocket Kodes (1996)
- Official Mortal Kombat 4 Arcade Secrets (1997)
- Official Mortal Kombat II Arcade Secrets (1994)
- Official Mortal Kombat II Pocket Kodes (1994)
- Official Mortal Kombat Trilogy Fighter's Kompanion (1996)
- Official NBA Hangtime Player's Guide (1996)
- Official Sega Genesis and Game Gear Strategies - '95 Edition (1994)
- Official Sega Genesis and Game Gear Strategies - 3rd Edition (1992)
- Okage : Shadow King - Prima's Official Strategy Guide (2001)
- Okami - Official Strategy Guide (2006)
- Omikron : The Nomad Soul - Prima's Official Strategy Guide (1999)
- On the Way to a Smile : Final Fantasy VII (2014)
- Once Upon Atari - How I Made History by Killing an Industry (2020)
- Oni (2001)
- Oni - Prima's Official Strategy Guide (2001)
- Onimusha 2 : Samurai's Destiny - Official Strategy Guide (2002)
- Onimusha 3: Demon Siege - Official Strategy Guide (2004)
- Onimusha : Dawn of Dreams - Official Strategy Guide (2006)
- Onimusha : Warlords - Official Strategy Guide (2001)
- Onimusha : Warlords - Prima's Official Strategy Guide (2001)
- Onimusha Tactics - Official Strategy Guide (2003)
- Online Games Guide (1997)
- OpenGL Game Programming (2002)
- Oregon Trail II - The Official Strategy Guide (1996)
- Orphen : Scion of Sorcery - Official Strategy Guide (2000)
- Outcast - The Official Strategy Guide (1999)
- Outlaws - The Official Strategy Guide (1997)
- Outpost - The Official Strategy Guide (1994)