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How do you get the yeti zombie

How do you get the yeti zombie
You have to go to level 18-30 and it'll show up. on sas zombie assault insane asylum on the cross section go to the bottom and open it and in there should be stalls and in one of the stalls there is a yeti and you have to open one of the stalls to release it. :D it killed me 2 mins after i released it