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This is the Sudoku 12x12 Vertical. The rectangles can also be horizontal.

Rules:

  • Every row and every column shall contain all digits 1 to 9 and letters A to C (no duplicates).
  • The rectangles shall contain all digits 1 to 9 and letters A to C (no duplicates).

The solver will always find a solution if it exists. If you press 'Solve', the solver will indicate that there is no solution, one solution, or more than one solution.

©2011, 2014 Renze de Waal.