(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 | |
|---|---|---|---|
 | Chocona Mall by Jay Dyer (on 16. August 2024, 21:19) | 18 |  93 % |
| Medieval Upheaval 4 by Nordy (on 24. June 2024, 08:00) | 79 | 97 % |
| Greedy Cages Sudoku by Phistomefel (on 3. May 2022, 22:41) | 65 | 99 % |
| Rivers and Islands Fillomino by Jesper (on 19. October 2020, 10:04) | 48 | 100 % |
| Snack'O'Mino [Level #2] by Christounet (on 9. March 2023, 12:47) | 46 | 100 % |
| U-Bahn mit gemischten Hinweisen (Teil 3) by Zzzyxas (on 28. December 2019, 13:32) | 38 | 99 % |
| Build Your Own Sloop by Piatato (on 5. July 2023, 21:23) | 34 | 99 % |
| Duplication by Xenonetix (on 28. July 2023, 00:00) | 35 | 97 % |
| German Whisper Cages by kolot (on 17. March 2022, 19:50) | 61 | 98 % |
| X-Sums / Skyscraper Killer Sudoku by KNT (on 16. September 2022, 18:17) | 54 | 100 % |
| Dynamic Duos by Niverio (on 22. August 2021, 17:32) | 47 | 98 % |
| Renban-na-na-na-na-na by SirSchmoopy (on 18. March 2022, 02:30) | 23 | 100 % |
| Quantum Whispers by tesseralis (on 17. July 2022, 01:09) | 21 | 100 % |
| Three-legged Dog by Abdul the Killer (on 9. November 2022, 19:45) | 47 | 93 % |
| Double or Nothing Roller Coaster by KNT (on 16. July 2024, 16:31) | 22 | 92 % |
| Sunshine by SudokuExplorer (on 26. January 2021, 02:00) | 40 | 98 % |
| Japanese Sum Cave Cipher #12: Pentominous by KNT (on 26. January 2023, 04:41) | 38 | 99 % |
| Killomino Sudoku by Phistomefel (on 10. June 2021, 03:54) | 85 | 99 % |
| Stingray (Killer Sudoku) by FryTheGuy (on 13. August 2021, 05:40) | 18 | 95 % |
| Magic Arrows by PotatoHead21 (on 3. September 2021, 04:34) | 18 | 96 % |
