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Headshots Only is a mode that appears in Call of Duty 4, Call of Duty: World at War, Call of Duty: Modern Warfare 2, Call of Duty: Black Ops, Call of Duty: Modern Warfare 3 and Call of Duty: Black Ops II as an option for private multiplayer matches (and in Call of Duty: Black Ops II, in a custom game of Zombies as well). The option makes it impossible to do damage to another player unless a headshot is acquired. Knife and explosions work as normal, however. This makes the game much more difficult to play, as most shots will do nothing, and players must aim carefully. It also makes certain killstreaks (such as Chopper Gunner) extremely difficult to use or altogether useless.