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.
