The Heist AI-generated Copy + Revise

6 grids · reconstruct grid #4 · NARC on 8/8 models

Grid Sequence
Three gems sit in a vault: ruby left, emerald center, sapphire right. The plan: move each gem one cell toward the door at the top, one per night. But on the third night, the inside man swaps the emerald for a fake — a grey stone — before it advances.
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