(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 | |
|---|---|---|---|
 | Sunshine by SudokuExplorer (on 26. January 2021, 02:00) | 43 |  97 % |
| Arrow Garden by PotatoHead21 (on 22. August 2021, 03:52) | 42 | 98 % |
| Flying Arrows by antiknight (on 2. March 2022, 19:36) | 48 | 92 % |
| Blind spot [Narrow Cave Sudoku Deconstruction 9x9] by Christounet (on 23. November 2023, 14:00) | 40 | 98 % |
| Hurricane by SudokuExplorer (on 16. March 2021, 01:00) | 64 | 98 % |
| Zum Geburtstag: Das Geschenk by moss (on 5. October 2017, 23:58) | 30 | 99 % |
| Thermal Galaxy Killer by Alexander Rappa (on 11. July 2020, 15:29) | 36 | 96 % |
| Chaos Construction: Snake by MagnusJosefsson (on 5. June 2021, 13:58) | 47 | 97 % |
| Carousel by twototenth (on 10. August 2021, 08:00) | 28 | 99 % |
| Knotted Arrows by antiknight (on 20. April 2022, 22:34) | 34 | 91 % |
| Syzygies of Susurrus by JayForty (on 3. March 2023, 21:55) | 29 | 92 % |
| TENtropy by Mad-Tyas (on 9. May 2023, 09:02) | 49 | 94 % |
| Hoverbike by tesseralis (on 10. July 2023, 04:47) | 34 | 98 % |
| Chaos Destruction X-Sums by lepton (on 18. February 2024, 08:07) | 35 | 92 % |
| DTMF (Dual Tone Multi-Frequency) by ebiggie (on 24. March 2025, 02:58) | 19 | 94 % |
| blue lining white trenchcoat by aqjhs (on 19. May 2025, 00:24) | 35 | 95 % |
| Chaos Construction: Double Internal X-Sums by KNT (on 9. March 2026, 03:38) | 55 | 93 % |
| Chaos Construction: Yin Yang (9x9) by Jesper (on 22. May 2022, 10:39) | 118 | 100 % |
| Castle in the Sky by filuta (on 23. April 2023, 12:35) | 18 | 94 % |
| Build Your Own Sloop by Piatato (on 5. July 2023, 21:23) | 40 | 98 % |
