100 Zombies 2 Level 97 Walkthrough:
Match the roman numerals to the same number in dots on the map.
From the green dot (starting position), figure out what direction each knob arrow has to face to get to each set of red dots.
Top left = I = South East (3 taps)
Top right = II = West (6 taps)
Bottom right = III = South (4 taps)
Bottom left = IV = North East (1 tap)
Tap the map to open the door.
Proceed to the next 100 Zombies 2 level!
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