(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 | |
|---|---|---|---|
 | Mystery Box by Nahileon (on 2. August 2022, 22:09) | 30 |  92 % |
| Entropy Sweeper by tesseralis (on 30. September 2023, 22:40) | 68 | 96 % |
| 4-Stern-Star-Battle by CJK (on 1. July 2021, 10:09) | 47 | 94 % |
| »Little Killer« unter Damen by glum_hippo (on 20. May 2020, 08:25) | 20 | 91 % |
| Kropki Pairs Level III by Qodec (on 20. January 2021, 00:13) | 26 | 92 % |
| Stingray (Odd) - Numbered rooms+Parity lines Sudoku by Qodec (on 11. January 2023, 23:02) | 62 | 96 % |
| Chicanery by ViKingPrime (on 13. May 2023, 17:00) | 18 | 94 % |
| Dual Slitherlink by Phistomefel (on 8. May 2020, 11:09) | 48 | 97 % |
| Japanische ABCtje-Summen by ibag (on 22. September 2012, 00:08) | 53 | 99 % |
| Buchstabenpaarreihen (4) by BFaw (on 30. March 2016, 11:00) | 36 | 97 % |
| Anti-Springer Killer, "Das Stundenglas" by glum_hippo (on 4. November 2020, 01:26) | 46 | 93 % |
| Scratches by PrimeWeasel (on 11. April 2021, 09:27) | 12 | 95 % |
| Black Eyes by Qodec (on 10. April 2022, 14:31) | 29 | 95 % |
| Signature Sudoku by Nell Gwyn (on 5. September 2022, 06:10) | 11 | 100 % |
| Mountain Aven by mormagli (on 2. October 2022, 04:37) | 14 | 90 % |
| An artists dream by daniel66 (on 28. August 2023, 05:28) | 17 | 91 % |
| Tatlins Turm (Chaos Construction) by glum_hippo (on 22. January 2024, 22:52) | 50 | 95 % |
| Matrix of Loopy Fireworks by Aspartagcus (on 11. April 2024, 09:38) | 25 | 98 % |
| Chaos Construction: Disconnected (2) by KNT (on 20. May 2024, 04:09) | 75 | 100 % |
| Thermos Construction by Prof.Dori (on 15. December 2023, 02:00) | 52 | 91 % |
