FLIPLANE: Every Delivery Reverses the Road Behind It

FLIPLANE is a deterministic self-reversing road delivery puzzle. Each stable road connects one district to Flip Hub and carries exactly one live direction. A stable vehicle may traverse only that direction. Immediately after the vehicle leaves a road, the same road reverses behind it. A successful arrival therefore edits the future city: it may prepare the next departure or make its destination unreachable.

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