(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 | |
|---|---|---|---|
 | Yin-Yang Killer by SirMoose (on 18. May 2024, 20:20) | 35 |  91 % |
| Roller Coaster mit Extras 12 by Uhu (on 9. March 2019, 22:13) | 44 | 95 % |
| Meidjuluk Star Battle by Grausbert (on 19. June 2023, 15:30) | 25 | 96 % |
| Graffiti: A yajilomino experience (Fillomino/Yajilin) by dumediat (on 22. August 2023, 04:07) | 50 | 98 % |
| Sparkle by Myxo (on 21. April 2024, 13:00) | 45 | 95 % |
| Four Unique Ways by kolot (on 30. April 2022, 16:38) | 39 | 92 % |
| Arrow Circus by PotatoHead21 (on 31. May 2023, 23:45) | 35 | 92 % |
| Killer Arrows by abed hawila (on 4. February 2021, 22:39) | 48 | 96 % |
| Lacunae (Sortadoku/Sandwich/Projected Sums) by dumediat (on 26. November 2023, 16:29) | 50 | 96 % |
| Kropki x-sums sudoku by Aspartagcus (on 18. November 2021, 19:45) | 56 | 100 % |
| X-Sums (Variant) by cdwg2000 (on 20. March 2021, 09:03) | 16 | 91 % |
| Pagoda by TotallyNormalCat (on 8. April 2021, 00:30) | 27 | 100 % |
| Overflow by TotallyNormalCat (on 7. March 2022, 21:00) | 106 | 97 % |
| The Amazing World of Grkles by Playmaker6174 (on 31. October 2022, 03:10) | 32 | 95 % |
| Hungarian Tapa-Like Loop by the_cogito (on 28. April 2023, 19:16) | 28 | 92 % |
| Revenge of the Fillometers by zzw (on 2. August 2023, 11:10) | 13 | 90 % |
| The Folding Halls by SkepticalMario (on 7. October 2024, 05:00) | 16 | 95 % |
| Cave / Stations by KNT (on 12. December 2023, 18:15) | 98 | 98 % |
| Heranwachsende Rundwege by Calavera (on 27. November 2010, 20:38) | 54 | 99 % |
| Looking for Phisto by EPH (on 22. February 2023, 18:29) | 40 | 94 % |
