100 Zombies Level 22 Walkthrough:
1. Change each knob so the arrows are pointing in the correct direction.
Look at the letters on the wall to get the direction.
Top left = NW = North West (tap 7 times)
Top right = S = South (tap 4 times)
Bottom left = SE = South East (tap 3 times)
Bottom right = E = East (tap 2 times)
Press the door to open it.
2. Proceed to the next 100 Zombies level!
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