(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 | |
|---|---|---|---|
 | Knights in Cages by Bert (on 29. January 2024, 16:41) | 49 |  96 % |
| Wichtel 2015 (8): Zahlenkoralle by wichtel (on 30. May 2016, 12:50) | 34 | 98 % |
| LM 2016 - Leftover: Mauerrundweg by CHalb (on 1. July 2016, 20:16) | 35 | 93 % |
| Think Outside the Cage by cristophermoore (on 22. September 2021, 03:35) | 39 | 98 % |
| Meidjuizy by Lizzy01 (on 14. November 2023, 11:36) | 38 | 100 % |
| They check in, but they don't check out by Strosahl (on 3. October 2024, 06:13) | 44 | 94 % |
| Regional Differences by Laake (on 22. April 2024, 22:50) | 79 | 97 % |
| Shenanigans by Jay Dyer (on 9. May 2023, 17:11) | 142 | 98 % |
| ECKIG - RUND - OVAL - Buchstabenrätsel by DocLogic (on 23. May 2020, 00:31) | 32 | 94 % |
| Diagonal Killer Sudoku by Selsted (on 2. August 2020, 15:10) | 39 | 92 % |
| MiniClues by Mesmer (on 13. August 2020, 01:36) | 35 | 94 % |
| Clasped Cages by Cane_Puzzles (on 5. December 2021, 17:14) | 34 | 94 % |
| Reciprocity by ICHTUES (on 26. June 2022, 06:00) | 131 | 97 % |
| Huey, Dewey, Louie by Crusader175 (on 3. September 2022, 15:00) | 71 | 97 % |
| Überlappungssudoku by Richard (on 25. December 2009, 12:00) | 86 | 94 % |
| GraVitron (by Twototenth and Tallcat) by twototenth (on 25. January 2022, 08:00) | 28 | 97 % |
| De l'autre côté... [9x9 mirrored digits] by Christounet (on 5. September 2023, 08:32) | 52 | 99 % |
| [159] Tilted by W1DEMAN (on 27. September 2023, 06:45) | 30 | 92 % |
| A Christmas Vacation Around the World (CTC Secret Santa 2023) by Niverio (on 27. December 2023, 15:11) | 31 | 91 % |
| 2CT Appreciation (German Whispers thermometer sudoku) by Qodec (on 1. January 2024, 23:34) | 87 | 97 % |
