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- On the Edge (Atlas Games) (October 1994)
- One Piece Collectible Card Game (Bandai) (dead link)
- One-On-One Hockey Challenge Collectible Card Game (Playoff Inc) (September 1995)
- Ophidian 2350 (Ophidian Inc./Fleer)
- OverPower (Fleer) (August 1995)
Read more about this topic: List Of Collectible Card Games