Logic Masters Deutschland e.V.

1. NORMAL SUDOKU
Normal Sudoku rules apply.

2. RATIO ARROWS Each circled bulb contains a normal Sudoku digit d. Its effective VALUE equals the sum of the digits on its shaft and is either d/2 or 2d.

3. VALUE SANDWICH Digits 1 and 9 are the bread and are excluded from the sum. Every cell strictly between them contributes its VALUE. Ordinary cells use their digit; ratio-circle cells use their effective arrow value.

4. REGION SUM LINES Box borders split each line into segments. Every segment on the same line has the same digit sum.