Logic Masters Deutschland e.V.

• Normal sudoku rules apply: Place the digits 1-9 once each in every row, column, and 3x3 box.
• Clues outside the grid are both Sandwich AND Skyscraper clues. As a sandwich, the clue gives the sum of the digits between 1 and 9 in that row or column. As a skyscraper, the clue represents how many digits would be visible when standing at the clue looking at its row or column, if each digit were a building with the height of its value. For example, the sequence 132495678 would have a skyscraper clue of 4, because you could see the buildings of heights 1, 3, 4, and 9, but the 5, 6, 7, and 8 would be hidden behind the 9, and the 2 is hidden by the 3. A '?' in a clue may represent any integer value.
• Digits along a thermometer must increase from bulb to tip.
• Digits on an arrow must sum to the digit in that arrow's circle.

Solve in CTC or f-puzzles