(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 | |
|---|---|---|---|
 | Wichtel 2015 (8): Zahlenkoralle by wichtel (on 30. May 2016, 12:50) | 33 |  97 % |
| Battle With The Archers 17: Precision by Playmaker6174 (on 24. September 2021, 14:00) | 38 | 99 % |
| Locust by antiknight (on 5. August 2022, 00:03) | 38 | 93 % |
| Thermo Yin Yang by oklux (on 10. October 2022, 19:44) | 35 | 97 % |
| Tens(e) Transitions by olima (on 21. May 2024, 10:00) | 38 | 96 % |
| Hooked (Region Sum Lines) by Florian Wortmann (on 11. August 2024, 12:24) | 160 | 96 % |
| Uncertain Sudoku #8 - Frame or X-Sums by Feadoor (on 27. March 2020, 17:00) | 53 | 96 % |
| Toroidal Snake - etwas verkürzt by lupo (on 4. February 2018, 23:53) | 21 | 94 % |
| Little Killer Sudoku #2 by Phistomefel (on 25. March 2020, 15:42) | 93 | 96 % |
| Past Midnight by Selsted (on 20. October 2020, 17:57) | 22 | 97 % |
| Wave Sudoku by Vebby (on 26. May 2021, 19:06) | 18 | 95 % |
| Diamonds by abed hawila (on 6. June 2021, 17:16) | 20 | 96 % |
| ABC-Box Skyscraper - From A Window by DiMono (on 18. August 2021, 18:58) | 38 | 98 % |
| Tic Tac Logic Sudoku by panthchesh (on 12. December 2021, 14:10) | 24 | 94 % |
| Noch ein Instructionless by ibag (on 17. February 2022, 23:58) | 18 | 99 % |
| Norinori Castle Wall by SudokuExplorer (on 11. March 2022, 17:30) | 20 | 94 % |
| Rounded Repulsion by Qril (on 9. June 2022, 02:04) | 21 | 96 % |
| Battle With The Archers 36 - Dual Puzzles: Directional Intuition by Playmaker6174 (on 24. September 2022, 11:27) | 19 | 94 % |
| Snake Nest Sudoku (chaos construction) by Al Fresco (on 9. December 2022, 20:47) | 22 | 96 % |
| Pentominous Sum Lines by Xendari (on 19. October 2023, 23:22) | 59 | 97 % |
