(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 | |
|---|---|---|---|
 | Distant Relations #2 by Big Tiger (on 13. March 2021, 06:27) | 15 |  94 % |
| Symmetry? by Qodec (on 13. April 2021, 20:16) | 79 | 90 % |
| Star Nurikabe N± by BenceJoful (on 2. October 2021, 02:24) | 30 | 94 % |
| arROw SudOkU - wHisPErinG cYCle by filuta (on 26. October 2021, 23:09) | 15 | 94 % |
| Twix by ICHTUES (on 2. October 2022, 06:00) | 15 | 90 % |
| The Violin by XeonRisq (on 21. December 2022, 19:00) | 19 | 96 % |
| 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 % |
| AntiknighthginkitnA by tribution (on 4. November 2022, 13:58) | 92 | 91 % |
| KUBA - Buchstabenrätsel by DocLogic (on 3. January 2020, 21:40) | 45 | 94 % |
| Rainbow Bricks by tsc (on 2. September 2022, 23:14) | 74 | 95 % |
| 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 % |
| Wichtel 2013 (8): Professor Kropkis Zahlenkabinett by wichtel (on 9. April 2014, 12:30) | 74 | 98 % |
| Counterproductive by marty_sears (on 24. June 2025, 10:47) | 180 | 96 % |
| JAMES BOND - Buchstabenrätsel by DocLogic (on 13. January 2020, 18:00) | 40 | 91 % |
| Hashi Sudoku by RockyRoer (on 4. July 2020, 17:40) | 15 | 98 % |
| 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 % |
