(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 | |
|---|---|---|---|
 | Line of Sight [German Whisper, Renban] by 3good5you (on 30. July 2023, 02:35) | 20 |  93 % |
| 3 1 by 1 4 (on 13. March 2024, 00:31) | 22 | 92 % |
| Muddlebug by Tyrgannus (on 17. June 2024, 09:12) | 37 | 95 % |
| Misshapen Skyscrapers by Belamis (on 19. June 2024, 21:20) | 17 | 94 % |
| Negative Space by ViKingPrime (on 26. December 2024, 02:35) | 18 | 91 % |
| Lumos Maxima by chameleon (on 5. October 2022, 16:10) | 539 | 95 % |
| Rose Killer Sudoku by SudokuExplorer (on 11. November 2021, 00:00) | 76 | 98 % |
| Zodiac Project: Cage Decoder by sujoyku (on 12. June 2024, 23:06) | 83 | 95 % |
| Triple Decker (Between Sandwich) by tallcat (on 3. August 2022, 17:53) | 64 | 97 % |
| Worm on a Stick by ThePedallingPianist (on 20. December 2022, 01:17) | 74 | 92 % |
| Directions by SudokuExplorer (on 23. December 2021, 00:00) | 91 | 98 % |
| Treasure Map by FryTheGuy (on 7. September 2021, 05:36) | 39 | 97 % |
| Glatt by ICHTUES (on 23. October 2022, 06:00) | 50 | 95 % |
| Modesty (Equalines Sudoku) by Mad-Tyas (on 21. February 2023, 09:16) | 53 | 98 % |
| Renban Caves by yttrio (on 11. January 2025, 02:59) | 120 | 98 % |
| Sudoku Variants Series (319) - Star Battle Sandwich by Richard (on 5. May 2021, 00:00) | 75 | 95 % |
| Pseudo Cluedo by marty_sears (on 6. April 2024, 01:13) | 79 | 98 % |
| Pointer Arrow Whisper Loop by yttrio (on 14. December 2024, 01:49) | 69 | 98 % |
| Eiskalte Magnetplatten by berni (on 16. December 2008, 22:28) | 107 | 95 % |
| Little Killer Sudoku #2 by Phistomefel (on 25. March 2020, 15:42) | 95 | 96 % |
