(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 | |
|---|---|---|---|
 | (Sudoku) Consecutive Decomposition by stimim (on 24. April 2021, 17:38) | 15 |  95 % |
| Crystal by Qodec (on 22. June 2021, 22:53) | 66 | 91 % |
| Suburbs by grkles (on 29. July 2021, 03:00) | 24 | 94 % |
| Masyudoku by Testarossa (on 26. September 2021, 12:35) | 25 | 97 % |
| Flikk Flakk by PetLov (on 12. December 2021, 14:29) | 15 | 91 % |
| It's all math! by tenaliraman (on 20. January 2022, 19:04) | 12 | 95 % |
| Dropped Kropkis by Dag H (on 27. May 2022, 10:49) | 14 | 90 % |
| Code 9-12 (Sudoku31) by Sumanta(ANU) (on 18. July 2022, 15:39) | 31 | 92 % |
| Pianosa by jwsinclair (on 13. September 2022, 18:50) | 14 | 93 % |
| Jellyfish by Nordy (on 11. February 2023, 08:00) | 16 | 91 % |
| Treasure Torus by RaygunUltra (on 19. May 2024, 05:16) | 12 | 93 % |
| Recoil: A Proper Introduction by damasosos92 (on 17. March 2025, 18:09) | 37 | 95 % |
| Bridging The Mines by Florian Wortmann (on 7. December 2023, 20:20) | 206 | 96 % |
| Colorguru Chaos Deconstruction by crispy16 (on 30. May 2022, 03:09) | 52 | 97 % |
| Antiknight-Killer Sudoku - Fortyfour by X13579 (on 16. June 2020, 10:28) | 64 | 93 % |
| The Stinger by Mark Sweep (on 21. October 2020, 12:31) | 50 | 93 % |
| Set The Bar High by SimiC (on 7. January 2022, 10:20) | 27 | 99 % |
| Holly (Killer Sudoku) by purpl (on 21. December 2025, 19:03) | 92 | 97 % |
| Sharing is Caring (Twist on Renban Sudoku) by purpl (on 30. March 2022, 00:57) | 35 | 97 % |
| Solver, there's a fly on my Sudoku! by IcyFruit (on 25. November 2023, 22:39) | 114 | 96 % |
