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Select the puzzle type to solve by recursive trial of digits
Samurai (Big X) Sudoku
Enter known digits in grid and, for Sujiko, totals where highlighted.
Sudoku must have no digit repeated in a row, column or square (in any block for Samurai Sudoku).
Sujiko must have no digit repeated (in any block for Master Sujiko).
Invalid digits are marked ∗ and repeated digits +.
Checking solution uniqueness takes longer. To test, a known puzzle is solved and the solution checked.