(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 | |
|---|---|---|---|
 | Fibonacci Fountain by Malrog (on 22. June 2022, 20:02) | 16 |  97 % |
| Quiet, please! (renban whispers sudoku) A.k.a. "The Pipe" by Lizzy01 (on 18. August 2022, 20:51) | 49 | 98 % |
| Cabo Verde by Qodec (on 3. October 2022, 20:17) | 98 | 98 % |
| POKAL Buchstabenrätsel / Letter Puzzle by DocLogic (on 2. December 2022, 16:30) | 29 | 96 % |
| The Friendly Stars by Crusader175 (on 10. January 2023, 15:00) | 24 | 97 % |
| Honk! by Nahileon (on 12. February 2023, 22:14) | 58 | 95 % |
| This One Goes To Twelve by Blashyrkh (on 22. March 2023, 22:43) | 22 | 92 % |
| Skyscraper Thermos by dennischen (on 28. March 2023, 19:48) | 26 | 96 % |
| Tower of Babel by Jay Dyer (on 6. June 2023, 17:47) | 144 | 96 % |
| Ice Cave by Agent (on 21. November 2023, 09:00) | 37 | 98 % |
| 7 Boom (Yin Yang). by palpot (on 10. February 2024, 13:55) | 23 | 95 % |
| The Edge of Reason by Abdul the Killer (on 7. May 2024, 12:34) | 20 | 94 % |
| Skate by dead_homer (on 19. May 2024, 00:25) | 38 | 92 % |
| Let It Go (Nurikabe/Skyscraper/Fortress) by MaizeGator (on 24. June 2024, 00:20) | 22 | 97 % |
| Whispering Negativity by yttrio (on 29. June 2024, 01:10) | 29 | 92 % |
| Convergence by dawsonjones2020 (on 13. September 2024, 16:23) | 38 | 96 % |
| Cave Sudoku by Phistomefel (on 10. July 2020, 12:39) | 90 | 96 % |
| Yin-Yang Fillomino by Phistomefel (on 7. January 2021, 01:21) | 71 | 98 % |
| Sudoku Variants Series (315) - Summing Up Sudoku by Richard (on 7. April 2021, 00:00) | 66 | 95 % |
| Long Island [Shimaguni Fillomino] by MicroStudy (on 5. May 2023, 01:11) | 53 | 97 % |
