(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 | |
|---|---|---|---|
 | Mysterious Lines 2: All WRAPT Up by mathpesto (on 26. September 2021, 17:25) | 33 |  95 % |
| Cursor by ICHTUES (on 26. December 2021, 06:00) | 17 | 95 % |
| Arrowings (version 2) by kolot (on 27. January 2022, 11:30) | 19 | 93 % |
| Fire Watchers by Angelo (on 15. March 2022, 23:09) | 18 | 97 % |
| Entangled by Flywinged (on 23. August 2022, 16:23) | 22 | 90 % |
| Echo Chamber by ndsurgenor (on 26. February 2023, 11:00) | 20 | 93 % |
| 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 % |
| Renbanwiches by Ennead (on 26. June 2024, 13:56) | 20 | 93 % |
| Pear Tree by jwsinclair (on 17. March 2025, 21:48) | 70 | 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 % |
| Crossroads on Another World by JeffWajes (on 12. December 2025, 07:23) | 62 | 97 % |
| Leaning Tower by marty_sears (on 4. November 2023, 09:10) | 128 | 98 % |
| 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) | 92 | 94 % |
| Thermo Dot by FullDeck-Missing (on 4. April 2023, 23:54) | 96 | 91 % |
| Anti-8 Killer by Blashyrkh (on 25. September 2023, 20:51) | 86 | 94 % |
| Pea-thagorean Theorem (with sujoyku) by ChinStrap (on 6. January 2025, 03:46) | 95 | 94 % |
