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In a 4×4 colored Sudoku problem, each row, column, and color set must contain the digits 1 to 4. Similarly, in a 3×3 puzzle, each row, column, and color set must contain the digits 1 to 3.
Contributed by: Izidor Hafner (March 2012)
Open content licensed under CC BY-NC-SA
Wolfram Demonstrations Project
Published: March 6 2012