Logic Masters Deutschland e.V.

Close Friends

Rules:

• Normal sudoku rules apply.
• Each row, column, and box contains exactly 3 friendly cells (cells whose value equals the index of the row, column, or box containing cell).
• A clue in the corner of a cell indicates the number of non-friendly cells visible from the marked cell along its row and column, including the marked cell; friendly cells block the view, and the marked cell cannot be friendly.

Solve on f-puzzles or CTC.