(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 | |
|---|---|---|---|
 | Anti-knight Thermo Sudoku #2 - Thermocouples by RSP (on 19. July 2020, 19:57) | 98 |  99 % |
| Archers and Kings by SudokuExplorer (on 30. March 2021, 01:00) | 71 | 97 % |
| Anti-Knight Weirdity 5 by Jeet Sampat (on 25. February 2023, 20:19) | 42 | 94 % |
| Funhouse by zegres (on 12. April 2023, 14:52) | 62 | 95 % |
| Odd X-Sums by Realshaggy (on 25. December 2021, 05:00) | 50 | 96 % |
| Wichtel 2015 (11): Versunkenes Inselreich entdeckt by wichtel (on 27. June 2016, 21:05) | 29 | 95 % |
| Primesweeper Sudoku by SenatorGronk (on 23. June 2020, 01:30) | 35 | 92 % |
| Imploded Compass Sudoku by stephane.bura (on 11. May 2021, 20:10) | 24 | 100 % |
| District 9 by tesseralis (on 17. August 2022, 10:15) | 22 | 100 % |
| The Amazing World of Grkles by Playmaker6174 (on 31. October 2022, 03:10) | 28 | 95 % |
| Irrwisch Sudoku: X-Sums by Gliperal (on 1. June 2023, 01:41) | 64 | 98 % |
| Hooligans Underground (Slingshot U-Bahn) by Piatato (on 29. May 2023, 21:21) | 20 | 99 % |
| Sudoku Variants Series (385) - Consecutive Sums Sudoku by Richard (on 21. September 2022, 02:00) | 76 | 99 % |
| It's all about sharing by Emphyrio (on 3. February 2023, 17:50) | 35 | 96 % |
| Double Date [Doublers, Killer, Renban, Arrow collab with Tallcat] by Malrog (on 15. April 2024, 14:47) | 41 | 96 % |
| Addierter Überlappungssudoku III by Richard (on 14. May 2010, 12:00) | 81 | 96 % |
| Roller Coaster mit Extras 8 by Uhu (on 19. August 2018, 10:12) | 50 | 98 % |
| Yin-yang Anti-Knight by Tom1i (on 30. April 2020, 21:59) | 13 | 95 % |
| Ignorant Killer Sudoku - Part 2 by ProwlingTiger (on 12. May 2020, 23:10) | 15 | 98 % |
| Pointed Knights by PotatoHead21 (on 3. March 2022, 08:30) | 45 | 95 % |
