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- ORBITOR #336220 pending unknown
- Orbit - Playing with Gravity #552120 pending unknown
- Orbitron #1049360 pending unknown
- Orborun #308580 pending native
- Orb Rivals #664490 pending unknown
- Orbs #660450 pending unknown
- Orb The Ball #711450 pending unknown
- Orc Attack: Flatulent Rebellion #268520 pending unknown
- Ord. #1079000 pending unknown
- Organosphere #811620 pending unknown
- Organ Quarter #605830 pending unknown
- Original Journey #639470 pending unknown
- Origin of Decay #952130 pending unknown
- Origin Of Destiny: Crimson Awakening #448570 pending unknown
- Orion Trail #381260 pending unknown
- Orogenesis #936740 pending unknown
- Orpheus's Dream #1097000 pending unknown
- Ortus Arena, strategy board game online, FOR FREE #498850 pending unknown
- Orwell: Ignorance is Strength #633060 pending unknown
- Orwell's Animal Farm #1398100 pending unknown
- Oscillatron: Alien Frequency #823730 pending unknown
- Ossuary #363500 pending unknown
- Ostrich Runner #1481810 pending unknown
- Ostrofa #1097300 pending unknown
- Oswald's Adventure #688680 pending unknown
- Otaku's Fantasy 2 #788130 pending unknown
- Otherskin #1622630 pending unknown
- Other Tanks #543780 pending unknown
- Other Worlds India #576050 pending unknown
- OTTTD #312630 pending unknown