Mod 9 makes it solvable
| Solver | Solution date | 
|---|---|
| karen_birgitta | on 9. October 2021, 11:16 | 
| Yerui | on 30. June 2021, 13:58 | 
| panthchesh | on 30. June 2021, 06:00 | 
| bigger | on 30. June 2021, 05:55 | 
| RockyRoer | on 30. May 2021, 12:50 | 
| hints_ | on 30. May 2021, 03:20 | 
| SudokuExplorer | on 26. May 2021, 17:04 | 
| jhuijts | on 26. May 2021, 01:59 | 
| kublai | on 25. May 2021, 15:24 | 
| StefanSch | on 25. May 2021, 15:10 | 
| LMettrop | on 25. May 2021, 10:35 | 
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