Via su.doku.es I found another variant of the famous Sudoku puzzles. It’s called Pandigital Sudoku.
Object is to fill in the Sudoku grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. These are the original Sudoku rules. Additional the rows form 9 correct arithmetic expressions reading from left to right.
There is only one solution to complete Pandigital Sudoku. Happy Puzzling!