Logic Masters Deutschland e.V.

Rules:

Normal sudoku rules apply. Shade nine cells in the grid such that there is one shaded cell in each row and column (boxes can contain any number of shaded cells, including none).

For each shaded cell, the first digits in its row and column give the position of that cell in its row and column, and the last digits in its row and column must sum to twice the position of the shaded cell within its box (example: R6C5 has position 5 in its row, position 6 in its column, and position 8 in normal reading order in its box. If this cell is shaded, then R6C1 is a 5, R1C5 is a 6, and R9C5 + R6C9 = 16).

Cells that are separated by a king’s move cannot contain the same digit, except for the two circled cells, which do contain the same digit.

Links:

Hello everyone, I am pleased (and slightly nervous) to present you my very first sudoku. It is inspired by Phistomefel's Ancient Wall and the Easter Miracle sudoku by Farkov and TopAutism, and I think I came up with something quite surprising.

Fair warning: this puzzle is going to test your endurance. It is not easy! Good luck!