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Standard 9x9 sudoku rules apply. Antiknight: Any two cells separated by a knight's move in chess cannot contain the same digit. Nonconsecutive: Any two orthogonally adjacent cells cannot contain consecutive digits. Quadruples: Digits in white circles must be present at least once in the cells the clue touches. If a digit appears more than once in a circle, it must be present at least that many times in the cells the clue touches.
X-Quad
By addie
Standard 9x9 sudoku rules apply. Antiknight: Any two cells separated by a knight's move in chess cannot contain the same digit. Nonconsecutive: Any two orthogonally adjacent cells cannot contain consecutive digits. Quadruples: Digits in white circles must be present at least once in the cells the clue touches. If a digit appears more than once in a circle, it must be present at least that many times in the cells the clue touches.