Logic Masters Deutschland e.V.

Place the digits 0-9 once into each row, column, and region. Identical digits may not be separated by a knight's move. The digits 0 and 9 may not be orthogonally or diagonally adjacent to each other or themselves.

A clue outside the grid is either an X-Sums clue or a Sandwich clue, but not both. I.e. exactly one of the following is true:

• The clue gives the sum of the digits between the 0 and 9 in the indicated row or column.
• The clue gives the sum of the first X digits in that row or column, starting from the digit next to the clue, which is equal to X.

Online solver: SudokuPad