(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 | |
|---|---|---|---|
 | U-Bahn LITSO (8x9) by the_cogito (on 4. December 2024, 21:34) | 17 |  94 % |
| walk out into velvet by aqjhs (on 23. April 2026, 01:01) | 32 | 99 % |
| Varianten-Samurai-Sudoku by JonaS2010 (on 9. September 2018, 09:09) | 58 | 98 % |
| Return of the killer tomatoes (Shikaku killer) by PrimeWeasel (on 7. January 2024, 17:32) | 36 | 94 % |
| Recombination by Jay Dyer (on 11. October 2021, 20:05) | 28 | 98 % |
| Exums by Xenonetix (on 27. May 2022, 22:22) | 50 | 99 % |
| Pentomino Sandwich by RockyRoer (on 9. January 2023, 23:42) | 24 | 98 % |
| Irrwisch Sudoku: X-Sums by Gliperal (on 1. June 2023, 01:41) | 73 | 98 % |
| Council Bluffs by glum_hippo (on 23. June 2023, 14:19) | 62 | 98 % |
| 真笑Puzzles013--Chaos Construction--“庄子” 004 by cdwg2000 (on 9. January 2021, 05:05) | 33 | 98 % |
| Drumsticks by antiknight (on 18. May 2022, 12:01) | 36 | 93 % |
| Denominators by AnalyticalNinja (on 29. January 2024, 00:30) | 32 | 96 % |
| Yin Yang Kropki Sudoku by Phistomefel (on 19. April 2022, 10:24) | 113 | 98 % |
| Badminton (Parity mirror sudoku with arrows and diagonal) by Qodec (on 5. August 2023, 01:12) | 77 | 97 % |
| Irregular Whirlpool by jojo81gaming (on 6. May 2022, 15:33) | 58 | 95 % |
| Kropki x-sums sudoku by Aspartagcus (on 18. November 2021, 19:45) | 57 | 100 % |
| Funhouse by zegres (on 12. April 2023, 14:52) | 69 | 96 % |
| RAT RUN 31: Equivalence by marty_sears (on 25. March 2026, 01:00) | 441 | 98 % |
| Fremde Notizen by berni (on 22. May 2011, 22:48) | 17 | 98 % |
| Sum 41 - Little Killer / Arrow Sudoku by Mr.Menace (on 6. March 2021, 09:37) | 35 | 95 % |
