Oni is a third-person action game developed by Bungie West, a division of Bungie. Released in 2001, it was Bungie West's only game. It broke new ground by blending third-person shooting with hand-to-hand combat, resulting in a unique, yet familiar game for third-person shooter enthusiasts. In 1999, while still in development, Oni won the Game Critics Awards for Best Action/Adventure Game.

There are ten different guns in Oni, including handguns, rifles, rocket launchers, and energy weapons. Power-ups such as "hyposprays", which heal damage, and cloaking devices, which render the player invisible, can be found scattered throughout the levels or on corpses. Since the player can carry only one weapon at a time and ammunition is scarce, hand-to-hand combat is also effective. The player can punch, kick, and throw enemies; progressing into later levels unlocks stronger moves and combos.
There are multiple classes of enemy, each with its own style of unarmed combat. Each class is subdivided into tiers of increasing strength. As in Bungie's earlier Marathon titles, tiers are color-coded.
Oni does not confine the player to fighting small groups of enemies in small arenas; each area is fully open to explore. The fourteen levels are of various sizes, some large enough to comprise an entire building. Bungie hired two architects to design the buildings.

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