NARC
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Puzzle ID
Title
Sequence Length
6
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Grid Sequence
Narrative
A value spreads from the top-left corner. Each step, every cell adds 1 to its value (mod 10) — this is the additive phase (steps 1-3). At step 4, the pattern REVERSES: every cell subtracts 1 (mod 10) instead. From step 5 onward, it subtracts again. Grid 4 (position 3) is masked — it is the first subtraction step, so its values equal those of step 3 minus 1 (mod 10).
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