Combined Sudoku

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This combination variant was introduced by Cihan Altay at the 1st Sudoku World Championship.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The colored extra-regions must contain each the digits 1 through 9.

In each 3x3 box their is a differet rule to follow:

  • Upper left - Digital Sudoku: Digits are in digital form, as given below.
  • Upper centre - Even/Odd Sudoku: Yellow cells must contain odd digits, green cells must contain even digits.
  • Upper right - Consecutive Sudoku: All neighbouring cells with consecutive digits have a colored border.
  • Centre left - Sum Sudoku (Killer Sudoku): Digits in a sub-region add up to the specified number.
  • Centre - Classical Sudoku: No special rule.
  • Centre right - Pips Sudoku: Digits are given as pips, like on dominoes or dices, as given below.
  • Lower left - Big/Small Sudoku: Red cells must contain small digits (1 - 4), blue cells must contain big digits (5 - 9).
  • Lower centre - Greater/Less Sudoku: The inewquality between each pair of digits must stand correct.
  • Lower right - Sum Box Sudoku: First two row of numbers add up to the number formed on the third row.

Combined Sudoku