(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 | |
|---|---|---|---|
 | Mnmle Mgntplttn by berni (on 11. April 2016, 14:13) | 36 |  98 % |
| PYRAMIDE - Buchstabenrätsel / Letter puzzle by DocLogic (on 3. February 2020, 18:21) | 36 | 95 % |
| Embark (Fog of war/Deconstruction/Killer/Yajilin) by dumediat (on 21. January 2023, 13:50) | 144 | 98 % |
| Thermography by arbitrary (on 12. December 2023, 16:22) | 73 | 95 % |
| Kombisudoku: Chaos - Pünktchen by Richard (on 11. January 2009, 20:28) | 122 | 93 % |
| Slingshot Sudoku - Confrontation by stephane.bura (on 26. August 2020, 20:00) | 26 | 97 % |
| Sudoku-GP Leftover (1): Liar-X-Sums by JonaS2010 (on 27. October 2020, 17:43) | 36 | 98 % |
| BLT by zetamath (on 19. June 2021, 20:30) | 30 | 98 % |
| Wrapping Paper on Boxing Day by twototenth (on 28. December 2021, 08:00) | 32 | 97 % |
| Compass Cave by MagnusJosefsson (on 14. January 2022, 08:26) | 27 | 100 % |
| Dr. Sudoku by Hecspeed (on 9. September 2022, 08:28) | 27 | 98 % |
| Sudoku Variants Series (387) - Adjacent Products Sudoku by Richard (on 5. October 2022, 02:00) | 59 | 93 % |
| Zeta and Kappa by twototenth (on 18. October 2022, 08:00) | 32 | 96 % |
| Entropic Arena by Raumplaner (on 16. October 2022, 12:07) | 33 | 92 % |
| Everything is Wrogn by Sumanta(ANU) (on 30. August 2023, 06:23) | 33 | 93 % |
| A Beautiful Nightmare by Allagem (on 3. March 2024, 11:22) | 63 | 91 % |
| RAT RUN 8: Discontinuous by marty_sears (on 24. July 2024, 01:00) | 318 | 97 % |
| Thermo X Sudoku by Phistomefel (on 2. December 2020, 20:08) | 140 | 93 % |
| Odd / Even Killer Sudoku (#1) by Mr.Menace (on 30. October 2020, 21:11) | 22 | 91 % |
| Little Antiking Killer by PrimeWeasel (on 10. November 2020, 15:58) | 23 | 97 % |
