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headerheaderrighttitleplatform and genre
O.R.B.
 Adventure
Obscure
 Strategy
Oddworld 2: Abes Exoddus
 Action
Oddworld: Abes Oddysee
 Adventure
One Must Fall: Battlegrounds
 Action
Oni
 Alternative
Operation Blockade
 Fighting
Operation Flashpoint: Cold War Crisis
 Adventure
Operation Flashpoint: Red Hammer
 Alternative
Operation Flashpoint: Resistance
 Action
Operation Tiger Hunt
 Fighting
Outcast
 Alternative
Outdoor Life: Sportsmans Challenge
 Fighting
Outlive
 Adventure
Outpost
 Action
Outpost 2: Divided Destiny
 Alternative
Outwars
 Adventure
Overdrive
 Alternative
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