Logic Masters Deutschland e.V.

Rules:

• Classic Sudoku: Every row, column and 3x3 box must contain every number from 1 to 9.
• Dutch Whispers: Every two consecutive digits along an orange line must have a difference of at least 4.
• Parity Lines: Every pair of consecutive cells along a red line must contain an odd digit and an even digit.
• Kropki: Two digits separated by a white dot are consecutive; two digits separated by a black dot have a 1:2 ratio.
• Negative XV: No pair of orthogonally adjacent digits can sum up to 5 or 10.