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How to play
Fill this 4×4 Sudoku with numbers 1–4. Every row, column, and outlined 2×2 box must contain each number once. Select an editable cell, then use the number buttons or keyboard 1–4. Erase or Backspace clears a cell. Given numbers are fixed. Each puzzle has one solution. Conflicting entries are rejected; each costs 10 of the 200 available points, down to a minimum of 10.