Name Format Release date
Obscure II WII 
Ocean Commander WII 
Ocean Commander DS 
Odama GC 
Official Nintendo Magazine WII 
Okami WII 
Okamiden DS 
One Piece Gigant Battle DS 
One Piece Grand Adventure GC 
One Piece Unlimited Adventure WII 
One Piece: Unlimited Cruise SP2 3DS 
Onechanbara: Bikini Zombie Slayers WII 
Onimusha Tactics GBA 
ONM WII 
Onslaught WII 
Open Season WII 
Operation Winback N64 
Opoona WII 
Orbital GBA 
Over The Hedge GC 
Over The Hedge DS 
Over the Hedge GBA 
Overlord Dark Legend WII 
Overlord Minions DS