Logic Masters Deutschland e.V.

Rules

Normal Sudoku rules apply; each row, column and box contains the digits 1–9, once each.

Digits separated by three necessary orthogonally-adjacent moves may not differ by three.

Comments

Orthogonally-adjacent means a cell which shares the edge directly left, right, up or down.

Necessary means that fewer moves must be insufficient. In particular, the four cells immediately adjacent are excluded despite being possible with three moves, because one move will suffice.

For example, the digit 4 prevents digits 1/7 from appearing within its three-move diamond. The digit 3 prevents only digit 6 from appearing.

The given grid has at least 800 million Sudoku solutions, but only one solution which satisfies the digit difference rule.

Puzzle

Solve at SudokuPad or at F-Puzzles.