(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 | |
|---|---|---|---|
 | Complete Achromatopsia by angel_shaaark (on 5. June 2022, 10:25) | 32 |  95 % |
| Modulate the Thermostat by FullDeck-Missing (on 26. July 2022, 20:53) | 30 | 92 % |
| A-Sums Sudoku (5) by ICHTUES (on 6. November 2022, 06:00) | 23 | 96 % |
| Hesperia (Beachcomber) by dumediat (on 21. February 2024, 16:17) | 24 | 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 % |
| Hakata (Shikaku Chaos Construction) by sfushidahardy (on 29. July 2024, 07:53) | 68 | 98 % |
| Phantom Killer 9x9 by Mondestrunken (on 10. May 2020, 18:37) | 20 | 97 % |
| The Stinger by Mark Sweep (on 21. October 2020, 12:31) | 43 | 92 % |
| Hot Coffee [Thermo Killer Sudoku] by ogi.djukovic (on 20. February 2021, 08:00) | 22 | 91 % |
| 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 % |
| Turning Point by XeonRisq (on 5. October 2022, 04:00) | 22 | 91 % |
| Mini Suguru Pentominoes by Chefofdeath (on 19. March 2024, 01:59) | 23 | 91 % |
| High-Rise Whisper Loop by yttrio (on 15. June 2024, 02:24) | 17 | 94 % |
| 11x11 Classic Star Battle by Phistomefel (on 19. August 2020, 19:31) | 160 | 93 % |
| 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 % |
