(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 | |
|---|---|---|---|
 | Parity Quads by NurglesGift (on 9. February 2025, 18:32) | 35 |  93 % |
| Chaos Construction: X-Sums with Doublers by KNT (on 30. August 2022, 22:01) | 68 | 100 % |
| Slingshot Fillomino by Jesper (on 15. September 2020, 08:38) | 37 | 98 % |
| Enclosure by Xenonetix (on 21. September 2022, 01:11) | 37 | 100 % |
| Philadelphia by ICHTUES (on 28. November 2021, 06:00) | 43 | 95 % |
| Impossible Objects by tesseralis (on 8. September 2023, 07:40) | 37 | 98 % |
| Exactly Eighty by krangune (on 23. January 2022, 17:08) | 48 | 97 % |
| Shading Sudoku Collection by KNT (on 10. August 2022, 05:09) | 42 | 100 % |
| Liar Japanese Sums #6 - Ciphered Tapa by Niverio (on 10. September 2023, 20:47) | 43 | 99 % |
| Quadratum by Xenonetix (on 23. July 2022, 22:22) | 48 | 99 % |
| Chasm Construction by AFrayedKnot (on 23. May 2024, 22:35) | 113 | 98 % |
| ✖ by Gliperal (on 27. June 2021, 08:20) | 87 | 99 % |
| Japanische Inseln, knapp daneben by pirx (on 19. October 2014, 17:30) | 48 | 99 % |
| Loses Kalenderblatt April 2019 (2/2) by April (on 1. April 2019, 12:00) | 23 | 99 % |
| Verspäteter Geburtstagsgruß aus dem All by ibag (on 27. June 2019, 00:00) | 27 | 99 % |
| Die Kryptos - S04E03: Roller Coaster by tuace (on 21. January 2020, 08:06) | 51 | 100 % |
| Disjoint group little killer sudoku X by Lizzy01 (on 4. March 2021, 21:40) | 40 | 98 % |
| Aim for the Sky by udukos (on 28. March 2021, 22:12) | 32 | 98 % |
| . o T o . by Lisztes (on 30. June 2021, 01:00) | 19 | 92 % |
| Kodama by zetamath (on 20. January 2022, 04:32) | 42 | 98 % |
