Sudoku Variant 4: Addition Sudoku

Welcome to Addition Sudoku! Small numbers at 2×2 intersections equal the sum of the four surrounding cells. Standard rules + sum constraints.

➕ Addition Sudoku — 2×2 Corner Sums

💡 Numbers at grid intersections = sum of 4 surrounding cells.

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# What Is Addition Sudoku? Sum markers at 2×2 intersections constrain four cells. A sum of 10 with 4 distinct digits forces {1,2,3,4} — use these to eliminate candidates!

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