(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 | |
|---|---|---|---|
 | Game, set and no three in the corner by Fool on Hill (on 18. August 2022, 13:00) | 20 |  93 % |
| The Average Sudoku 2 by Lyun Licuss (on 12. September 2022, 05:39) | 17 | 92 % |
| Turning Point by XeonRisq (on 5. October 2022, 04:00) | 25 | 92 % |
| Wheat, Oats and Poppy by jcgodart (on 15. October 2022, 08:19) | 20 | 93 % |
| A-Sums Sudoku (5) by ICHTUES (on 6. November 2022, 06:00) | 25 | 96 % |
| Under Pressure (Pressurized Aquariums) by AnalyticalNinja (on 22. December 2022, 15:00) | 97 | 98 % |
| Pleiades (S-Cell Mean Mini Sudoku) by Ambrose (on 6. January 2023, 18:29) | 14 | 95 % |
| The Big Renbans by Nai Night (on 18. February 2023, 22:00) | 20 | 94 % |
| Bite Marks by ViKingPrime (on 8. March 2023, 17:00) | 31 | 99 % |
| Overlaps by damasosos92 (on 13. March 2023, 01:20) | 31 | 91 % |
| Unos - 8x8 Sudoku Pack by Joseph nehme (on 15. March 2023, 08:55) | 30 | 95 % |
| Chinese Takeaway (Yin Yang Killer) by BenTen (on 3. May 2023, 23:51) | 152 | 97 % |
| The Big Bang by EricRathbun (on 12. June 2023, 14:23) | 37 | 95 % |
| Emulsion by FKlauser (on 16. June 2023, 11:11) | 66 | 96 % |
| Killer Trainline (Tren + Sudoku Hybrid) by rockratzero (on 28. June 2023, 02:36) | 17 | 95 % |
| Whose Doubler Is It Anyway? by ViKingPrime (on 23. August 2023, 12:30) | 67 | 97 % |
| Betwen ty by glum_hippo (on 12. November 2023, 00:41) | 36 | 94 % |
| Sort Circuit by IcyFruit (on 13. November 2023, 22:49) | 47 | 93 % |
| The Prophecy (Zippular Lines #1) by heliopolix (on 15. December 2023, 00:43) | 36 | 95 % |
| Circles and Adders by Jay Dyer (on 24. December 2023, 12:04) | 40 | 96 % |
