Logic Masters Deutschland e.V.

Rules

• Normal sudoku rules apply.
• Sibling-Cells and "Einzelkind": In each row, column and box is exactly one sibling cell. A sibling cell must contain at least one other sibling cell in its surrounding 8 cells (3x3 area), except for one sibling cell, which is the "Einzelkind" and violates this rule.
• All sibling cells throughout the whole grid contain the same digit.
• Knights Move: Cells that are a chess knights move apart from a sibling cell contain a digit lower than 5.
• Little Killer Sums: Clues outside the grid show the sum of the digits on their indicated diagonal.