Core Rules
- Fill every row with 1 to 9.
- Fill every column with 1 to 9.
- Fill every 3x3 box with 1 to 9.
- Numbers cannot repeat in any row, column, or 3x3 box.
- Each dashed cage has a target sum.
- Numbers inside a cage must add up to the target sum.
- Numbers cannot repeat inside the same cage.
- Ranking rule: accuracy first, then speed.
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