(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 | |
|---|---|---|---|
 | Japanische Höhle mit Irrwisch von den Außerirdischen by ibag (on 27. March 2018, 00:00) | 44 |  99 % |
| Roller Coaster mit Extras 13 by Uhu (on 21. March 2019, 22:34) | 52 | 99 % |
| Chillicothe by glum_hippo (on 4. October 2023, 18:11) | 55 | 95 % |
| It Takes a Village by lmdemasi (on 25. September 2024, 01:09) | 45 | 95 % |
| A Powerful Duo (Entropy, Anti-Knight) by Mad-Tyas (on 16. May 2023, 09:08) | 49 | 95 % |
| Chaos CaveSudoku by MagnusJosefsson (on 7. December 2022, 11:55) | 87 | 98 % |
| Wichtel 2019 (5): Japanische Pentominoplätzchen by wichtel (on 25. August 2020, 05:01) | 36 | 99 % |
| Chaosandwich by grkles (on 11. April 2022, 19:24) | 84 | 99 % |
| Enclosure by Xenonetix (on 21. September 2022, 01:11) | 43 | 100 % |
| Surgical Excision by HalfBakedLunatic (on 1. July 2023, 05:02) | 47 | 96 % |
| Supernova by Nahileon (on 3. November 2021, 20:32) | 76 | 99 % |
| Shadow (Cave Skyscraper Hybrid) by tallcat (on 20. November 2022, 09:00) | 62 | 97 % |
| Regionometers by ThePedallingPianist (on 20. February 2024, 13:20) | 34 | 96 % |
| pull prank by aqjhs (on 6. September 2025, 06:09) | 39 | 100 % |
| I forget what 8 was for by sanabas (on 13. September 2025, 18:12) | 36 | 100 % |
| Peaceful Destruction by NXTMaster (on 21. November 2025, 00:00) | 38 | 100 % |
| Heyawake Sudoku by SennyK (on 22. January 2026, 22:02) | 39 | 96 % |
| Largest in Sight by Rab3aron (on 13. March 2026, 15:39) | 32 | 99 % |
| Ziemlich japanische Summen mit Irrwisch by ibag (on 10. June 2017, 10:00) | 27 | 99 % |
| Locust [Kropki Killer Sudoku] by Panthera (on 12. December 2020, 13:00) | 31 | 93 % |
