Hyper-Sudoku: This sudoku has four additional regions highlighted in a different background color.To indicate this the diagonals of the puzzle are highlighted by a different color. X-Sudoku: The digits 1 to 9 also have to appear exactly once in the two diagonals of the puzzle.None: You only have to deal with nine rows, nine columns and nine blocks in either square or squiggly format.Besides the classic version there are four kinds of extra regions: The regions are outlined with a thick line and the digits 1 to 9 have to appear exactly once in each region.Įxtra regions impose additional constraints on the puzzle. Instead of 9 square blocks the game grid consists of 9 non-square regions. The available grid styles are standard and squiggly. You can choose from two grid styles and five kinds of extra regions. Sudoku Pro offers additional sudoku variations besides the classical one.
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