Logic Masters Deutschland e.V.

So ChinStrap suggested to me this concept for a doppelgänger puzzle, I hope you like the take on it.

• Doppelgänger Sudoku:
  • In the 9x9 grid, every row, column, and box contains a 0 always, as well as eight out of the nine digits from 1 to 9 (ie, it's missing one digit)
  • No two row, no two column, and no two box may be missing the same digit
  • For each 0 in the grid, the digits missing in its row, its column, and its box must be three different digits.
  • Fill the cells outside the 9x9 grid with the digit missing from the corresponding row, column or box.
• Skyscraper Arrows:
  • The value of an arrow in a cell is equal to the digit in the cell.
  • The value of an arrow outside the grid and note space is equal to the missing digit in the corresponding row or column.
  • The value of an arrow indicates the number of digits seen in that direction, for that effect, digits block any lower or equal digit from being seen.
  • Zero (0) is never seen.
  • Non cell spaces block sight and are never seen.

Online in Sudokupad

On theme:

• gedenksäule
• zauberschein
• schutzstacheln
• speersäule
• steineichenwald
• zerrwelt / schemenkraft