The Code Isn't 1390
The vault just slammed shut over the Golden Donut of Destiny, the confetti cannons are charging, and the only clue on the keypad is a fake. The Code Isn't 1390 is a family-friendly print-&-solve logic puzzle: read the ten clues, cross every impossible code off a list of 5,000, and land on the one real four-digit combination. Pure deduction, great solo or with the family, with optional online hints and an answer check.
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