(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 | |
|---|---|---|---|
 | Zwei Bärenfreunde by berni (on 11. August 2010, 14:16) | 21 |  92 % |
| Divisibility Squares Sudoku by ProwlingTiger (on 16. July 2020, 03:33) | 21 | 97 % |
| Clock Faces Sudoku by Phistomefel (on 21. August 2020, 16:50) | 35 | 91 % |
| Wheel of Fortune by Qodec (on 4. September 2020, 13:34) | 23 | 94 % |
| XV Sandwiches by RockyRoer (on 21. November 2020, 04:47) | 33 | 94 % |
| Alley of Arrows by MavericksJD (on 19. April 2021, 13:36) | 34 | 99 % |
| 1590 by twototenth (on 8. February 2022, 08:00) | 31 | 96 % |
| [Fog of War Series] 4. Labyrinth by AstralSky (on 3. November 2022, 15:51) | 55 | 91 % |
| Fujiyama by Myxo (on 14. December 2022, 14:24) | 30 | 99 % |
| The Big One by IcyFruit (on 25. January 2024, 14:04) | 40 | 95 % |
| Venn Diagram Loops by Prof.Dori (on 9. May 2024, 16:44) | 49 | 99 % |
| Twin Killer Sudoku III by Richard (on 8. July 2009, 14:19) | 85 | 93 % |
| ripple by mormagli (on 29. November 2022, 22:26) | 76 | 97 % |
| Who Knows Where the Time Goes by juggler (on 28. December 2024, 07:50) | 49 | 97 % |
| 1. Teil der Trilogie: Ein verliebter Rundweg by berni (on 28. September 2010, 12:34) | 74 | 100 % |
| Castle Wall/Cave #2 by MagnusJosefsson (on 28. May 2021, 10:02) | 30 | 98 % |
| Ballast by wooferzfg (on 29. July 2023, 23:07) | 32 | 100 % |
| Réaltraí (Pentominous spiral galaxies/Fillomino) by dumediat (on 27. January 2024, 20:19) | 38 | 100 % |
| Kill Kill (Doubler Killer) by ICHTUES (on 28. August 2022, 06:00) | 57 | 97 % |
| Multi-grid Multi-variant Sudoku - Simon Is Dead! by DiMono (on 14. November 2020, 09:00) | 25 | 98 % |
