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Slippery When Undead is an achievement/trophy for Call of Duty: Black Ops II in Die Rise. It requires the player to kill five zombies in one shot from the Sliquifier. This can be easily done by creating a bundle of five zombies or more close to each other, then shooting one shot with the Sliquifier directly at them. The Sliquifier's effect may be a bit prolonged, so the player is advised not to kill the other zombies by other means while the fired liquid takes effect and chains with zombies in close proximity to one another.

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