100 Doors Runaway Level 31 Walkthrough:
1. Turn on the light. Pick up the spray can and use it all over the bar above the door.
Turn off the light and you'll see the numbers 75 and 39 (if you don't, use the spray can again).
Turn on the light, then press the keypad and enter 7539.
2. Proceed to the next 100 Doors Runaway level!
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