Extended Sudoku rules apply: Place the digits 0-9 in each row, column, and box, however there will be one digit in each that does not fit. This digit can vary between rows, columns, and boxes and needs to be determined by the solver.
Anti-Knight: Cells that are a Knight's move apart (in chess) may not contain the same digit.
XV: Digits separated by an X sum to 10, those separated by a V sum to 5. All Xs and Vs have been given.
Kropki Pairs: Digits separated by a black dot must be in a 2:1 ratio. Digits separated by a white dot must be consecutive.
Solution code: Row 5
yesterday, 17:54 by sigge
Very nice!
on 7. February 2026, 10:11 by Onkel_Dagobert
My experience was the exact opposite of EmX68’s: I found the break-in to be rather obvious, but struggled to finish because the puzzle refused to give in until the very end.
on 7. February 2026, 02:31 by Exigus
Very nice setting. Thanks!
on 6. February 2026, 17:24 by Bankey
Fun puzzle. Thanks, @ gadgetgreen :).
on 6. February 2026, 12:56 by EmX68
Excellent! I rated the puzzle 3 stars because the break-in is a bit tricky. But after that it has a beautiful flow. Thanks!