Logic Masters Deutschland e.V.

Rules:

• Normal sudoku rules apply.
• Digits a chess knight's move apart must be different.
• Modular lines: every set of three sequential digits along a line must contain a complete set of residues modulo 3, i.e. one digit from {1,4,7}, one from {2,5,8}, and one from {3,6,9}.
• Digits along lines may repeat if allowed by other rules.
• Cells with a grey circle must contain odd digits.
• Digits joined by a black dot must be in the 1:2 ratio.
• Digits joined by a white dot must be consecutive.
• Not all dots are given.

Play online using CTC App ("test" version with letters) or F-Puzzles