Call of Duty Modern Warfare 3 delivers an intense single-player campaign that picks up immediately following the events of Call of Duty: Modern Warfare 2 and escalates into World War 3. "Kill Confirmed" requires players to collect floating dog tags from the corpse of a downed enemy before the kill can be registered. However, the opposing team can pick up the dog tag as well to deny the other team of a kill. "Team Defender" requires both teams to try to capture a flag dropped by the first person who gets killed when the match starts, and hold it to gain double points per kill while the team without the flag only gets the default amount per kill. "Drop Zone" (where the player must hold a drop zone for points and care packages) "Team Juggernaut" (each team plays alongside an AI Juggernaut character), "Gun Game" (be the first to get one kill with every gun in the game) "One in the Chamber" (in which players are only allowed one pistol with one bullet and three lives where they can only get more bullets by killing other players). Along with this, players are allowed to create their own game modes with customized settings such as number of players and time limit.