(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 | |
|---|---|---|---|
 | Schatzsuche - Finale by AI1463 (on 31. July 2014, 14:06) | 36 |  98 % |
| Roller Coaster mit Extras 15 by Uhu (on 24. June 2019, 18:07) | 37 | 99 % |
| Unwrap the Gifts [2 for 1 special] by TotallyNormalCat (on 20. March 2021, 20:00) | 22 | 94 % |
| Greater Doppelganger by Kafkapharnaum (on 15. January 2022, 17:54) | 34 | 98 % |
| Friends in unknown lands (chaos construction) by filuta (on 11. June 2022, 13:10) | 19 | 93 % |
| Twilight Cave Sudoku by PixelPlucker (on 27. July 2022, 08:54) | 14 | 94 % |
| 8x8=9x9 by filuta (on 13. August 2022, 17:30) | 23 | 99 % |
| Out of the way by PrimeWeasel (on 18. October 2022, 10:13) | 19 | 94 % |
| Selfish Cages by Ennead (on 13. November 2022, 21:34) | 11 | 93 % |
| Crypto Japanese Cave: Smörgåsbord for Niverio by KNT (on 9. December 2022, 00:00) | 35 | 96 % |
| Masyun Yang (Yin-Yang Masyu Sudoku) by Samish (on 8. January 2023, 16:12) | 21 | 98 % |
| Not One Black Dot by mormagli (on 11. February 2023, 04:50) | 19 | 98 % |
| Solaris by Kafkapharnaum (on 3. March 2023, 15:34) | 22 | 97 % |
| Modular Gap Sums – Reverse Skyscrapers – Chaos by Elliptical (on 3. April 2023, 23:48) | 16 | 98 % |
| 9x9 Chaos Construction: Minesweeper by SudokuExplorer (on 11. April 2023, 00:03) | 55 | 92 % |
| U-Bahn with Quadrants for wooferzfg by KNT (on 22. April 2023, 16:45) | 35 | 96 % |
| Crypto Japanese Halligen for Gliperal by KNT (on 4. June 2023, 06:51) | 24 | 93 % |
| Bletchley Park by fjam (on 11. June 2023, 20:40) | 19 | 100 % |
| U-Bahn with Empty Clues (4) by KNT (on 28. July 2023, 15:50) | 43 | 97 % |
| Leviathan by Kafkapharnaum (on 6. August 2023, 00:56) | 15 | 94 % |
