Corrupt Sudoku

I haven’t seen this variant before, so I took the liberty of naming it. I wouldn’t be surprised if someone else had already invented it, though.

Corrupt Sudoku 1


  • Unlike regular Sudoku, numbers do repeat in rows, columns and regions.
  • Each row contains exactly one number twice, but the doubled number is different in each row.
  • Also, each row is missing exactly one number, but the missing number is different in each row.
  • The same applies to columns and regions.

For an easier puzzle, change the 5 in the top row into a 1. It’s not that hard, but getting used to the logic probably makes it harder.

EDIT: Corrected the rules. The old rules weren’t strict enough to guarantee an unique solution.

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