(Very) Hard AND nice puzzles
The following list contains portal puzzles that have been rated as nice or very nice and that are difficult. These puzzles are recommended for experts - and allow some time to solve.
| Description | solved | Rating | |
|---|---|---|---|
 | Knight's Whirlpool by SudokuExplorer (on 10. February 2022, 00:30) | 107 |  98 % |
| Confluence by mathpesto (on 24. April 2023, 17:00) | 64 | 98 % |
| Schrödinger Sudkuro by ICHTUES (on 30. October 2022, 06:00) | 48 | 98 % |
| Aqres of Shikaku Country (9x9) by mathpesto (on 29. October 2022, 22:57) | 35 | 98 % |
| Araf Killer Sudoku by Phistomefel (on 28. July 2020, 09:00) | 98 | 98 % |
| Thermo Sudoku by trivial171 (on 6. September 2020, 19:48) | 61 | 97 % |
| Compass Fillomino #3: Large grid by MagnusJosefsson (on 23. April 2021, 17:44) | 46 | 97 % |
| The Final Fourteen by FryTheGuy (on 20. October 2021, 05:38) | 26 | 96 % |
| Imbalanced Flower by MavericksJD (on 19. June 2022, 21:33) | 30 | 92 % |
| The Fifteenth Day of Christmas by cristophermoore (on 18. December 2022, 07:01) | 50 | 98 % |
| Target Acquired (Equalines Sudoku) by Sktx (on 4. February 2023, 22:17) | 25 | 96 % |
| The Postman Problem by ThePedallingPianist (on 6. July 2023, 13:16) | 23 | 100 % |
| hello DubiousMobius by aqjhs (on 5. July 2025, 00:00) | 26 | 96 % |
| 2d Wave Particles by zetamath (on 15. July 2021, 18:22) | 32 | 95 % |
| Mean World Syndrome [Mean Arrow, Kropki] by Miky (on 1. May 2023, 17:29) | 36 | 96 % |
| Summation U-Bahn by Agent (on 19. September 2023, 09:00) | 60 | 99 % |
| Adventskalender 2023, Türchen 16 - Untergrundangeln by Zzzyxas (on 16. December 2023, 07:00) | 32 | 98 % |
| Sandwich Product by Prof.Dori (on 5. July 2024, 09:28) | 36 | 95 % |
| grow so natural, i eat my kale by aqjhs (on 17. February 2025, 02:30) | 31 | 99 % |
| Self-determination by stephane.bura (on 5. September 2022, 15:46) | 80 | 98 % |
