(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 | |
|---|---|---|---|
 | Surgical Excision by HalfBakedLunatic (on 1. July 2023, 05:02) | 38 |  95 % |
| Sandwich Product by Prof.Dori (on 5. July 2024, 09:28) | 34 | 95 % |
| Wichtels Rätselsommer 2024 (3): Diebische Wichtel by wichtel (on 17. August 2024, 20:23) | 13 | 98 % |
| Roller Coaster mit Extras 17 by Uhu (on 9. April 2020, 20:36) | 35 | 99 % |
| Wichtel 2019 (5): Japanische Pentominoplätzchen by wichtel (on 25. August 2020, 05:01) | 32 | 100 % |
| The Snake Nest by matt383 (on 9. October 2020, 14:03) | 38 | 98 % |
| The Corners Are Even - Arrow Odd/Even Sudoku by Mr.Menace (on 2. February 2022, 23:04) | 36 | 96 % |
| Build Your Own Killer: Criminal Mind by Playmaker6174 (on 3. March 2022, 18:07) | 38 | 100 % |
| Stairity - Chaos Construction by the_cogito (on 10. August 2022, 03:07) | 81 | 98 % |
| Powercut [S-cell, Renban, RSL] by Christounet (on 30. June 2023, 23:48) | 34 | 100 % |
| Even Lighting by Jay Dyer (on 15. February 2023, 23:02) | 59 | 97 % |
| Killer Sudoku - Dirty Tricks by DiMono (on 25. November 2020, 16:27) | 46 | 97 % |
| Motel (Deconstruction: Numbered Rooms) by purpl (on 8. April 2022, 16:42) | 41 | 100 % |
| Negators by mathpesto (on 20. August 2022, 00:41) | 50 | 95 % |
| Negative Space [Meta-Renban Sudoku] by wisty (on 12. April 2023, 10:41) | 19 | 93 % |
| Confined Sandwich Chaos by PrimeWeasel (on 6. July 2022, 16:55) | 51 | 95 % |
| Century (Counting Circles + Numbered Rooms) by tallcat (on 29. May 2024, 08:00) | 42 | 99 % |
| Adventskalender 2020, Finale - Riesenrundweg by Zzzyxas (on 1. December 2020, 07:00) | 25 | 100 % |
| 真笑Puzzles023--N-Sums Sudoku--Counter by cdwg2000 (on 5. February 2021, 17:45) | 27 | 100 % |
| Chaos Construction: Arachne by tesseralis (on 24. September 2022, 08:20) | 27 | 98 % |
