(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 | |
|---|---|---|---|
 | Line of Sight [German Whisper, Renban] by 3good5you (on 30. July 2023, 02:35) | 21 |  92 % |
| 3 1 by 1 4 (on 13. March 2024, 00:31) | 23 | 93 % |
| Brötchenstempel by Myxo (on 12. March 2024, 10:24) | 42 | 97 % |
| Renbanwiches by Ennead (on 26. June 2024, 13:56) | 20 | 93 % |
| Pear Tree by jwsinclair (on 17. March 2025, 21:48) | 69 | 93 % |
| European Whispers by Belamis (on 27. May 2025, 21:02) | 19 | 92 % |
| Little region sum with CC by psninn (on 8. July 2025, 14:02) | 45 | 96 % |
| Centripetal Slingshot Sudoku by stephane.bura (on 30. July 2020, 20:00) | 53 | 99 % |
| Naked Filloku (Filloku #2) by mormagli (on 16. September 2023, 14:09) | 48 | 93 % |
| Spin City by Bremster (on 26. November 2022, 04:47) | 91 | 94 % |
| Thermo Dot by FullDeck-Missing (on 4. April 2023, 23:54) | 95 | 91 % |
| Anti-8 Killer by Blashyrkh (on 25. September 2023, 20:51) | 85 | 94 % |
| Pea-thagorean Theorem (with sujoyku) by ChinStrap (on 6. January 2025, 03:46) | 95 | 94 % |
| Für Luca zum Geburtstag: Krypto-Inselrundweg by CHalb (on 4. November 2019, 09:29) | 30 | 95 % |
| 6x6 Hypercube by DiMono (on 18. February 2022, 23:40) | 28 | 95 % |
| [Fog of War Series] 3-2: Sequel to Portals by AstralSky (on 24. April 2023, 22:36) | 41 | 91 % |
| Wrogn Quasd by Sumanta(ANU) (on 20. August 2023, 13:18) | 32 | 90 % |
| Twenty (and) Twenty-Five by Big Tiger (on 26. December 2024, 23:22) | 38 | 95 % |
| One Fish, Two Fish by Blobz (on 13. December 2025, 16:00) | 76 | 95 % |
| Leaning Tower by marty_sears (on 4. November 2023, 09:10) | 125 | 98 % |
