(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 | |
|---|---|---|---|
 | Verspäteter Geburtstagsgruß aus dem All by ibag (on 27. June 2019, 00:00) | 30 |  99 % |
| Neural Network by Xenonetix (on 26. November 2022, 14:41) | 40 | 96 % |
| Locomotive by wooferzfg (on 20. July 2023, 20:28) | 34 | 96 % |
| Dancing Like Butterfly Wings by dennischen (on 31. December 2024, 02:28) | 49 | 96 % |
| Chaos Construction: Oenopion's Revenge by Niverio (on 3. July 2022, 10:13) | 84 | 99 % |
| Hey, Are You Awake? by mathpesto (on 7. August 2022, 22:06) | 44 | 98 % |
| Disjoint group little killer sudoku X by Lizzy01 (on 4. March 2021, 21:40) | 46 | 99 % |
| Matty Didn't Call You Back Because He Had The Wrogn Number by Laake (on 26. September 2024, 22:11) | 100 | 96 % |
| Japanische Inseln, knapp daneben by pirx (on 19. October 2014, 17:30) | 50 | 99 % |
| Chaos II: The Two Killers by lerroyy (on 18. April 2022, 22:25) | 52 | 98 % |
| Little Thermo Killer by Jesper (on 19. June 2020, 23:30) | 63 | 96 % |
| Throne Room (Sudokuvania boss) by SkepticalMario (on 20. June 2025, 07:07) | 93 | 95 % |
| Chaos Deconstruction: Cave by KNT (on 6. July 2022, 07:57) | 82 | 96 % |
| ✖ by Gliperal (on 27. June 2021, 08:20) | 96 | 99 % |
| Parity Party VII — "Party Sandwiches" by glum_hippo (on 25. April 2020, 23:24) | 23 | 94 % |
| Adventskalender 2020, Finale - Riesenrundweg by Zzzyxas (on 1. December 2020, 07:00) | 29 | 100 % |
| Syzygy by jovi_al (on 13. March 2021, 18:05) | 91 | 98 % |
| Aim for the Sky by udukos (on 28. March 2021, 22:12) | 36 | 98 % |
| Paulas Geheimschrift-Rundweg-Puzzle by CJK (on 19. April 2021, 10:27) | 26 | 100 % |
| Parity Party XIX, "Kryppto" by glum_hippo (on 10. June 2021, 17:06) | 29 | 100 % |
