(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 | |
|---|---|---|---|
 | A38 + Enge Höhle (Permakultur) by ibag (on 1. April 2024, 11:44) | 14 |  98 % |
| Watchtowers by oskode (on 28. August 2024, 18:26) | 18 | 92 % |
| Howl-py Birthday, ViKingPrime! by ChinStrap (on 21. April 2025, 17:32) | 15 | 94 % |
| Masyu Hexuro by Nell Gwyn (on 21. September 2025, 04:23) | 15 | 94 % |
| AntiknighthginkitnA by tribution (on 4. November 2022, 13:58) | 92 | 91 % |
| KUBA - Buchstabenrätsel by DocLogic (on 3. January 2020, 21:40) | 45 | 94 % |
| Rocket launch (Damo Collab) by palpot (on 23. March 2025, 21:54) | 33 | 93 % |
| Quietly Walking the Paths by EPH (on 21. September 2022, 02:22) | 48 | 95 % |
| Holly (Killer Sudoku) by purpl (on 21. December 2025, 19:03) | 88 | 96 % |
| Wichtel 2013 (8): Professor Kropkis Zahlenkabinett by wichtel (on 9. April 2014, 12:30) | 74 | 98 % |
| JAMES BOND - Buchstabenrätsel by DocLogic (on 13. January 2020, 18:00) | 40 | 91 % |
| Reversion to the Mean (Regression zur Mitte) by cristophermoore (on 20. March 2021, 23:24) | 16 | 93 % |
| Primescraper: Skysweeper by grkles (on 12. April 2021, 20:49) | 27 | 94 % |
| (Sudoku) Consecutive Decomposition by stimim (on 24. April 2021, 17:38) | 15 | 95 % |
| Crystal by Qodec (on 22. June 2021, 22:53) | 66 | 91 % |
| Suburbs by grkles (on 29. July 2021, 03:00) | 24 | 94 % |
| Masyudoku by Testarossa (on 26. September 2021, 12:35) | 25 | 97 % |
| Flikk Flakk by PetLov (on 12. December 2021, 14:29) | 15 | 91 % |
| It's all math! by tenaliraman (on 20. January 2022, 19:04) | 12 | 95 % |
| Dropped Kropkis by Dag H (on 27. May 2022, 10:49) | 14 | 90 % |
