100 Zombies Level 34 Walkthrough:
1. Shake your phone/device left and right and a small piece of wood will fall down to the ground. This is the last number.
Look at the roman numerals with the wooden boards and follow the red arrows:
1st = LII = 52
2nd = I = 1
3rd = IV = 4
4th = I (small wooden piece that fell) = 1
Press the keypad and enter 52141, then press OK.
2. Proceed to the next 100 Zombies level!
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