(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 | |
|---|---|---|---|
 | Sandwich Boxes by Ennead (on 8. June 2023, 20:31) | 33 |  92 % |
| Cycle Four by Big Tiger (on 24. June 2023, 09:11) | 17 | 91 % |
| Nurikabe Cousins by Agent (on 22. August 2023, 09:00) | 49 | 98 % |
| Matrix of Loopy Fireworks by Aspartagcus (on 11. April 2024, 09:38) | 31 | 96 % |
| Duet (Overlapping Tetrominous Loop) by the_cogito (on 28. June 2024, 22:34) | 16 | 100 % |
| U-Bahn with Fillomino enclosures #2 (10x10) by Jesper (on 7. November 2024, 17:49) | 37 | 99 % |
| Stationary Loop Deconstruction (1-7) by Playmaker6174 (on 18. February 2025, 08:00) | 45 | 100 % |
| Coordinate Coordinate Arrows Arrows by damo_89 (on 3. January 2026, 12:20) | 53 | 96 % |
| Abstract Art by marty_sears (on 30. November 2023, 02:23) | 116 | 96 % |
| New York City by ICHTUES (on 30. April 2025, 07:50) | 125 | 97 % |
| Nashville by ICHTUES (on 19. June 2022, 06:00) | 80 | 96 % |
| Stingray (Odd) - Numbered rooms+Parity lines Sudoku by Qodec (on 11. January 2023, 23:02) | 65 | 96 % |
| Heads or Tails? by Xenonetix (on 27. July 2022, 15:51) | 41 | 99 % |
| five boxing wizards by aqjhs (on 6. January 2025, 07:53) | 50 | 91 % |
| Japanische Koralle Krypto by Uhu (on 22. January 2017, 16:24) | 47 | 99 % |
| Mehrdeutige Rätsel - Fillomino 2 by uvo (on 1. March 2017, 13:01) | 31 | 92 % |
| Adventskalender 2020, Türchen 12 - Landvermessung by Zzzyxas (on 12. December 2020, 07:00) | 61 | 97 % |
| The Descent by mathpesto (on 12. October 2022, 03:41) | 28 | 94 % |
| Amphiboly by SSG (on 14. October 2022, 05:42) | 27 | 100 % |
| Vampires by Mad-Tyas (on 23. January 2023, 11:06) | 79 | 95 % |
