(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 | |
|---|---|---|---|
 | Layla by mith (on 3. October 2022, 19:11) | 75 |  94 % |
| Die Kryptos - S03E06: Hochhausblöcke by tuace (on 30. October 2018, 10:15) | 30 | 98 % |
| Pet Shop Panic! by tesseralis (on 3. October 2022, 09:37) | 31 | 96 % |
| Hochhäuser in Japanischen Summen, Teil 2 by pirx (on 27. April 2017, 18:00) | 32 | 97 % |
| Crossroads by TotallyNormalCat (on 16. January 2021, 03:00) | 30 | 97 % |
| The inconvenient square root (chaos construction) by filuta (on 19. December 2021, 13:30) | 30 | 100 % |
| Fractured by Andrewsarchus (on 13. June 2022, 09:15) | 30 | 97 % |
| Hungarian Tapa Roller Coaster #2 (13x17) by KNT (on 28. September 2022, 16:37) | 32 | 98 % |
| Japanese Sum Cave Cipher #9: Skyscraper Ring by KNT (on 20. December 2022, 02:44) | 30 | 99 % |
| Deranked (Full Rank Deconstruction) by the_cogito (on 26. June 2023, 17:38) | 32 | 100 % |
| Chaos Meidjudokuluk by tesseralis (on 14. October 2023, 07:19) | 28 | 100 % |
| Chaos Construction: Roller Coaster (9x9) by KNT (on 9. February 2023, 01:18) | 64 | 100 % |
| Palindrome Portals by TotallyNormalCat (on 1. January 2021, 23:00) | 34 | 90 % |
| Siamese Coral (2) by KNT (on 9. March 2023, 00:10) | 30 | 99 % |
| Chaos Pentominoes by Tacosian (on 9. March 2024, 23:14) | 31 | 93 % |
| Wichtel 2016 (11): Frohe Weihnachten! by wichtel (on 1. October 2017, 22:00) | 25 | 91 % |
| Quite a Mouthful by Gliperal (on 2. January 2021, 23:49) | 25 | 95 % |
| Megha-Tropiques by Xenonetix (on 14. February 2022, 21:00) | 22 | 94 % |
| Rosette by Gliperal (on 26. August 2022, 02:43) | 22 | 94 % |
| Geschenk für pin7guin: Kropki-U-Bahn unter Kropki-Hochhäusern by Zzzyxas (on 6. September 2013, 00:00) | 42 | 99 % |
