(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 | |
|---|---|---|---|
 | Adventskalender 2023, Türchen 6 - Japanischer Buchstabensalat by Zzzyxas (on 6. December 2023, 07:00) | 60 |  99 % |
| Fortune Cookie by pieguy (on 30. January 2024, 01:53) | 35 | 92 % |
| Coupled Up by IcyFruit (on 13. February 2024, 17:14) | 69 | 93 % |
| Sight Lines Sum (Yin Yang) by palpot (on 15. May 2024, 21:00) | 39 | 95 % |
| Vogelscheuche by Myxo (on 21. July 2024, 13:02) | 99 | 93 % |
| Japanische Summen-Pentominos 2358 by Uhu (on 14. April 2017, 22:48) | 45 | 96 % |
| Japanische Summen-Höhle Prime/Krypto by Uhu (on 10. August 2017, 19:56) | 42 | 99 % |
| Überlappungssudoku II by Richard (on 29. January 2010, 12:00) | 72 | 92 % |
| Schlingerpfad 000217 by adam001 (on 3. July 2012, 21:25) | 14 | 92 % |
| Killer Raute by tuace (on 12. January 2014, 15:30) | 46 | 98 % |
| WSC-Training: Clueless Hidden Classic by JonaS2010 (on 7. October 2019, 18:33) | 60 | 98 % |
| Flying 9s by abed hawila (on 18. December 2020, 19:59) | 18 | 92 % |
| Parity Party XVIII, "Clones" by glum_hippo (on 11. April 2021, 06:00) | 14 | 98 % |
| 6x6 Chaos Construction: Boundary N-Sums (墨子) by SudokuExplorer (on 27. April 2021, 01:00) | 29 | 94 % |
| Albert I, King of the Belgians by Bais (on 13. August 2021, 03:17) | 26 | 94 % |
| Juosan Killer sudoku by udukos (on 25. October 2021, 05:54) | 47 | 97 % |
| Frankenstein by PotatoHead21 (on 6. November 2021, 13:40) | 29 | 96 % |
| Twinkle Twinkle by starwarigami (on 15. May 2022, 21:18) | 14 | 92 % |
| Balanced Sudoku by Nell Gwyn (on 6. August 2022, 04:03) | 14 | 95 % |
| Lookin' Hot by djorr (on 5. December 2022, 14:00) | 17 | 90 % |
