(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 | |
|---|---|---|---|
 | Zahlenbild-Rundweg by Calavera (on 22. June 2009, 16:07) | 126 |  96 % |
| Valence by zetamath (on 12. August 2021, 19:08) | 55 | 96 % |
| Triples by zetamath (on 3. November 2021, 03:40) | 54 | 97 % |
| The Fountain by Tobias Brixner (on 14. October 2023, 11:49) | 89 | 96 % |
| Counting Regions Sudoku by Agent (on 13. August 2024, 09:00) | 24 | 98 % |
| Modular Mid-Loop by yttrio (on 5. October 2024, 01:48) | 24 | 91 % |
| The Roc's Shadow (Zippular Lines #3) by heliopolix (on 27. December 2023, 16:22) | 37 | 92 % |
| Broken Slitherlink by ahaupt (on 21. May 2020, 11:02) | 50 | 99 % |
| XV*Cage 4 by NurglesGift (on 22. July 2024, 14:27) | 124 | 94 % |
| Libra (Thermo) by Florian Wortmann (on 22. October 2022, 16:05) | 60 | 92 % |
