Logic Masters Deutschland e.V.

• Normal sudoku rules apply: Place the digits 1-9 once each in every row, column, and 3x3 box.
• Numbers outside the grid are valid clues for one and only one of the following constraints: Sandwich, Skyscraper, or X-Sum. Which clue represents which constraint must be determined.
• Sandwich: If a clue is a Sandwich clue, the number represents the sum of the digits between the 1 and 9 in that row or column.
• Skyscraper: If a clue is a Skyscraper clue, the number represents the amount of buildings that could be seen from the clue if each cell in its row or column were a building the height of its digit.
• X-Sum: If a clue is an X-Sum, the number represents the sum of the digits in the first X cells seen from that clue, where X is the first cell seen.

Solve in SudokuPad