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Hello, detective! I am Professor Pippin. Every case hides exactly one rule. Find it, and the case is yours.

Spot the hidden rule. Crack the case.

Each case shows a sequence made by one secret rule. Reveal extra clues if you need them, then pick the rule that fits every example. No timers, no tricks, just sharp detective work.

Local Top 5

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Challenge a friend

Finish a run to get a signed recap code. A friend can paste it below to check it is genuine.