Ogre Battle 64: Person of Lordly Caliber
Ogre Battle 64 offers a detailed branching story and great depth of customization, both executed brilliantly within the limitations of a 35-meg cartridge.
O.D.T.: Escape... Or Die Trying
ODT is an effort to capture Tomb Raider-style gameplay in a futuristic setting.
Olympic Hockey 98
The only possible way I could recommend this game is if you're an avid Olympic hockey fan.