(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 | |
|---|---|---|---|
 | Arrow Jungle by PotatoHead21 (on 18. August 2023, 11:49) | 24 |  93 % |
| Yin-Yang Renbanominos 1 by Die Hard (on 29. April 2024, 07:56) | 25 | 92 % |
| The Fillomino Frog by Die Hard (on 7. January 2025, 10:49) | 26 | 97 % |
| Heyawake Chaos by mellowrobinson (on 27. January 2026, 07:31) | 27 | 99 % |
| 10-in-9 killer sudoku #3 by Nylimb (on 11. February 2020, 22:35) | 46 | 99 % |
| Antiknight Killer Sudoku by PotatoHead21 (on 15. September 2021, 05:20) | 100 | 99 % |
| Zodiac Project: Astrolabe by Sotehr (on 30. October 2025, 00:00) | 54 | 98 % |
| Japanische Bahnhöfe, Teil 2 by pirx (on 27. May 2020, 13:00) | 26 | 99 % |
| Open Face Apple by pieguy (on 7. August 2023, 22:49) | 30 | 90 % |
| Chaotic Meidjuluk #2 by PrimeWeasel (on 5. January 2026, 20:31) | 24 | 100 % |
| U-Bahn mit Haltestellen III by tuace (on 28. March 2016, 16:22) | 47 | 95 % |
| X Zip Line by antiknight (on 29. November 2023, 19:36) | 56 | 97 % |
| Cave Fillomino #1 (10x10) by Jesper (on 29. August 2020, 11:40) | 79 | 100 % |
| Wichtel 2016 (12 und Schluss): Unterirdische Katakomben mit Kerzenbeleuchtung by wichtel (on 12. October 2017, 21:01) | 26 | 98 % |
| Rundweg Family Photo by pokerke (on 14. February 2011, 00:57) | 83 | 99 % |
| Implications of Parity by Niverio (on 30. July 2022, 13:06) | 55 | 98 % |
| Who Knows Where the Time Goes by juggler (on 28. December 2024, 07:50) | 64 | 96 % |
| Chained killer sudoku no. 3 by Shinya (on 23. August 2021, 22:33) | 26 | 99 % |
| Stroopwafel by pieguy (on 19. October 2023, 23:13) | 29 | 92 % |
| Foggy “Pair”-rows by Visumation (on 8. January 2025, 14:09) | 64 | 91 % |
