Logic Masters Deutschland e.V.

Doppelgänger Sudoku:

• Fill each cell of the main 9x9 grid such that every row, column and 3x3 box contains a 0 and eight different digits from 1-9.
• No two rows, no two columns and no two boxes may be missing the same digit.
• For each 0 in the grid, the digits missing in its row, column and box must be three different digits.
• The column on the right is for recording the digits missing from the respective rows. Similarly the row on the bottom is for recording the digits missing from the respective columns, and the box to the bottom-right is for recording the digits missing from the respective boxes. These digits must be filled in for the solution check to work.

• The sum of the digits on a line between two squares is equal to the product of the two digits in those squares.
• Digits may repeat on lines if allowed by the other rules.
• If a line has the same square as both its endpoints, multiply that digit with itself to get the sum of the line.

Links:
SudokuPad: https://sudokupad.app/ptfaxxixnd