Floor 81:
-Hold your device so that the top is pointing at the ground. The “6”s will now appear as “9”s. Simply punch on the keypad “9×9” then press “=” and the door will open.
IMPORTANT: Make sure you’re holding your device in the correct position. Otherwise the door won’t open even if you punched in the correct formula.
Next Level: 100 Floors Floor 82 Walkthrough
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