(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 | |
|---|---|---|---|
 | Dante's Journey by SenatorGronk (on 30. August 2023, 16:00) | 38 |  97 % |
| Geometry Exam #4 by Blashyrkh (on 19. November 2023, 17:13) | 43 | 93 % |
| Midnight Express (Stations + Star Battle) by The Book Wyrm (on 17. February 2025, 18:30) | 39 | 93 % |
| Vortex by NicoD (on 11. June 2025, 05:30) | 43 | 96 % |
| Full Rank Sudoku by Gliperal (on 3. April 2023, 07:18) | 111 | 97 % |
| Compression by Jay Dyer (on 1. September 2024, 21:33) | 110 | 97 % |
| KNAST, BANDIT, GANOVE - Buchstabenrätsel by DocLogic (on 21. February 2020, 18:13) | 36 | 94 % |
| Multi-color Madness! by esotericVideos (on 17. November 2021, 06:02) | 36 | 96 % |
| Cipher Hungarian Tapa by the_cogito (on 5. April 2023, 21:49) | 35 | 94 % |
| The Taste of Entropy by Mad-Tyas (on 10. September 2024, 05:35) | 42 | 93 % |
| Nonconsecutive Renban by Phistomefel (on 9. February 2022, 20:46) | 122 | 97 % |
| Japanische Höhle vom Hein mit Hilfe vom Irrwisch by ibag (on 27. March 2020, 00:00) | 32 | 99 % |
| Cryptic Kropki Sudoku by Greg (on 25. July 2020, 22:01) | 38 | 98 % |
| Saturn's Moons by cristophermoore (on 9. June 2022, 00:25) | 77 | 100 % |
| COCKTAIL - Buchstabenrätsel / Letter Puzzle by DocLogic (on 26. August 2022, 13:55) | 34 | 94 % |
| Sumro by Myxo (on 25. May 2023, 15:49) | 40 | 99 % |
| Inside by zetamath (on 13. October 2024, 19:05) | 82 | 96 % |
| Zwei Rundwege by Calavera (on 30. July 2009, 15:14) | 76 | 98 % |
| Stingray by zetamath (on 23. June 2021, 19:36) | 41 | 92 % |
| Medieval Upheaval by Nordy (on 2. July 2022, 08:00) | 86 | 98 % |
