(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 | |
|---|---|---|---|
 | The Song of the Serpent and the Wanderer - A tribute to Nordy by damasosos92 (on 17. July 2023, 03:40) | 63 |  94 % |
| [Fog of War Series] 11.Misty Doublers by AstralSky (on 9. December 2022, 09:00) | 45 | 91 % |
| Colossal Nurikabe Sudoku by Christounet (on 13. June 2023, 00:47) | 39 | 100 % |
| TE-N [Liar JSCC Ten Line] by Christounet (on 4. July 2024, 14:55) | 21 | 99 % |
| Loop Nurikabe by wooferzfg (on 2. February 2023, 16:31) | 100 | 99 % |
| Chaos Construction: Border Sums by kolot (on 1. February 2022, 17:06) | 70 | 99 % |
| Verhexte Sudukte by Menxar (on 19. September 2017, 12:53) | 29 | 98 % |
| Bubble Trouble by Stavros96 (on 16. March 2021, 12:01) | 30 | 98 % |
| Nary A'Dot by mormagli (on 2. February 2023, 22:42) | 30 | 95 % |
| Seeing Around the Corner by Die Hard (on 8. July 2024, 00:07) | 31 | 98 % |
| Cave / Directionless Yajilin Permaculture by Agent (on 21. August 2024, 09:00) | 30 | 100 % |
| Summation U-Bahn #3: Castle Wall by Agent (on 17. October 2023, 09:00) | 35 | 100 % |
| SET PIECE [Multiset Sudoku] by wisty (on 21. November 2023, 17:55) | 37 | 97 % |
| Japanese Sums #6: Volatility by Myxo (on 21. March 2024, 10:05) | 35 | 100 % |
| Nabner Doubledeal by Jay Dyer (on 20. September 2023, 13:35) | 51 | 97 % |
| Nikolaus Challenge by Luigi (on 6. December 2009, 06:12) | 14 | 94 % |
| Rainy Day Sudoku 12 (squared) & 35 by joecat (on 30. July 2020, 11:20) | 42 | 100 % |
| Wichtel 2019 (7): Die mutierte Sieben by wichtel (on 14. September 2020, 18:12) | 25 | 99 % |
| -45 Killer by Mesmer (on 21. August 2020, 14:39) | 14 | 98 % |
| Broken Mirrors (Anti-king, Little Killer) by emmettcito (on 13. April 2021, 20:56) | 14 | 94 % |
