The government is totalitarian, telling the populace that what are actually dangerously toxic regions are wilderness preserves, and uses its police forces, the Technological Crimes Task Force (TCTF), to suppress opposition.

To solve international economic crises, all nations have combined into a single entity, the World Coalition Government. In the game, Earth is so polluted that little of it remains habitable.

The events of Oni take place in or after the year 2032. However, frame slippage is a common problem when multiple non-player characters near the player are attacking. The Oni engine implements a method of interpolation that tweens key frames, smoothing out the animation of complex martial-arts moves. Bungie hired two architects to design the buildings. The fourteen levels are of various sizes, some large enough to comprise an entire building. Oni does not confine the player to fighting small groups of enemies in small arenas each area is fully open to explore. Green flashes show the opponent has high health, red flashes show the enemy is near death. Also color-coded are the levels of health each opponent has, indicated by a flash when the player strikes or shoots them. As in Bungie's earlier Marathon titles, tiers are color-coded, in this case by green (weakest), blue, and red (strongest). Each class is subdivided into tiers of increasing strength. There are multiple classes of enemy, each with its own style of unarmed combat. The player can punch, kick, and throw enemies progressing into later levels unlocks stronger moves and combos. Since the player can carry only one weapon at a time and ammunition is scarce, hand-to-hand combat is the most effective and common means of defeating enemies. 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. There are ten different guns in Oni, including handguns, rifles, rocket launchers, and energy weapons. Konoko using a move effective on multiple enemies, the Devil Spin Kick

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