(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 | |
|---|---|---|---|
 | Battle With The Archers 19: War Games by Playmaker6174 (on 8. October 2021, 12:33) | 35 |  95 % |
| In The Middle of The Knight by Ridhwan (on 30. March 2023, 09:00) | 36 | 92 % |
| A Zip of Blood (Vampires, Zippers) by gdc (on 13. March 2024, 17:46) | 38 | 93 % |
| Ausgedehnte Mittagspause by Richard (on 26. February 2010, 12:00) | 65 | 97 % |
| Yin Yang Position Sums Sudoku by Jesper (on 3. November 2022, 19:17) | 70 | 98 % |
| Lasersummen (3) by BFaw (on 20. January 2012, 20:10) | 31 | 96 % |
| Adventsportale, Teil 2 by pirx (on 9. December 2018, 12:00) | 33 | 97 % |
| Lines of the Banner by JeremyDover (on 29. January 2022, 14:11) | 37 | 95 % |
| Reserved Parking (rush hour + variant sudoku) by rockratzero (on 30. April 2023, 10:58) | 68 | 93 % |
| Line of Sight Chaos Production by RockyRoer (on 29. January 2022, 03:39) | 58 | 99 % |
| Battlefield Sudoku by Realshaggy (on 31. May 2020, 13:08) | 59 | 96 % |
| The Key by jetalix (on 8. January 2021, 20:02) | 27 | 98 % |
| Irregional by riffclown (on 2. April 2022, 19:21) | 29 | 92 % |
| Pile of 15 (Killer Sudoku) by Cane_Puzzles (on 2. December 2022, 15:51) | 59 | 95 % |
| Curious Consecutive Snake (by Paws and Ben) by starwarigami (on 19. January 2024, 11:45) | 34 | 98 % |
| Easter Eggs by Jobo (on 31. March 2024, 09:09) | 60 | 98 % |
| Wichtel 2011 (10): Japanische Summen - knapp daneben by wichtel (on 7. March 2012, 10:00) | 75 | 97 % |
| 159 Shards by Qodec (on 22. September 2021, 12:36) | 83 | 92 % |
| Partial Killer 1 by MavericksJD (on 23. September 2020, 09:41) | 57 | 93 % |
| Campfire by Nahileon (on 12. January 2022, 21:24) | 51 | 97 % |
