(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 | |
|---|---|---|---|
 | Sandwiched Japanese Sums by leftovercube (on 29. December 2021, 21:38) | 22 |  96 % |
| A-Sums Sudoku (5) by ICHTUES (on 6. November 2022, 06:00) | 23 | 96 % |
| Hesperia (Beachcomber) by dumediat (on 21. February 2024, 16:17) | 26 | 95 % |
| Gerade Ungerade Koralle by tuace (on 3. November 2013, 18:30) | 61 | 93 % |
| Don't you fear the drumsticks by chameleon (on 26. February 2023, 12:41) | 68 | 94 % |
| Cageless (X) Killer Sudoku no. 3 by Shinya (on 3. April 2020, 22:10) | 23 | 96 % |
| Phantom Killer 9x9 by Mondestrunken (on 10. May 2020, 18:37) | 20 | 97 % |
| Hot Coffee [Thermo Killer Sudoku] by ogi.djukovic (on 20. February 2021, 08:00) | 22 | 91 % |
| 真笑Puzzles036--Chaos Construction-- “韩非子” 002 by cdwg2000 (on 27. March 2021, 09:27) | 20 | 93 % |
| Set Aside the Obvious by JoWovrin (on 26. June 2021, 16:33) | 19 | 94 % |
| 真笑Puzzles041--Wall Sudoku by cdwg2000 (on 29. January 2022, 13:40) | 21 | 97 % |
| Quietly Walking the Paths by EPH (on 21. September 2022, 02:22) | 47 | 95 % |
| Bridging The Mines by Florian Wortmann (on 7. December 2023, 20:20) | 185 | 96 % |
| Four Sum-Linked Sudokus by Genomico (on 10. September 2020, 21:33) | 53 | 97 % |
| Japanische Summen modulo 3 by ibag (on 6. August 2012, 07:46) | 69 | 98 % |
| Encrypted Sandwich by cfop (on 31. January 2021, 21:18) | 19 | 95 % |
| Bleu Blanc Dot by PetLov (on 27. March 2021, 12:44) | 19 | 93 % |
| Carnivorous Pansy by PjotrV (on 10. April 2021, 09:22) | 20 | 95 % |
| Stingray by mormagli (on 25. September 2022, 04:47) | 20 | 95 % |
| Killer Trainline (Tren + Sudoku Hybrid) by rockratzero (on 28. June 2023, 02:36) | 16 | 95 % |
