Trapped in Time is an achievement in Mob of the Dead. It requires the player to use the Acid Trap, the Fan Trap and the Tower Trap (which must be upgraded), prior to round 10.
The Acid Trap is located at the entrance to the cafeteria, which must be bought to allow access. The Fan Trap is located at the Warden's Office door, but first requires unlocking a Voltmeter through Afterlife before the door will open. The Tower Trap is located by the bottom of the docks near the water. It must be activated first, during which another Voltmeter will be revealed, which must be shocked in Afterlife so that the trap will fire its upgraded rockets.
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