(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 | |
|---|---|---|---|
 | Millstone by jwsinclair (on 13. June 2024, 20:59) | 78 |  98 % |
| Japanische Höhle vom Hein mit Hilfe vom Irrwisch (2) by ibag (on 20. April 2020, 00:00) | 30 | 100 % |
| Building Blocks by grkles (on 2. February 2022, 04:00) | 34 | 97 % |
| All Directions by Joseph nehme (on 19. February 2022, 07:48) | 33 | 97 % |
| U-Bahn with Fillomino enclosures #3 (12x12) by Jesper (on 10. November 2024, 13:37) | 33 | 96 % |
| Chaos Construction: X-Sums / Sandwich by KNT (on 13. April 2022, 17:12) | 64 | 94 % |
| Kropki Magnetplatten III by tuace (on 12. January 2014, 07:30) | 31 | 99 % |
| Unique Values by Mesmer (on 25. January 2021, 12:20) | 71 | 98 % |
| Dubai by Jay Dyer (on 7. March 2023, 22:49) | 35 | 94 % |
| Half Full Jar by Nimo (on 25. February 2025, 10:47) | 34 | 95 % |
| Bouquet by Myxo (on 15. September 2023, 10:41) | 94 | 98 % |
| [PAC] Cipher JS Clone Sudoku by TVDK (on 20. September 2025, 13:56) | 29 | 95 % |
| Half Life (Yin Yang Deconstruction) by Agent (on 30. August 2022, 09:00) | 85 | 99 % |
| X---V*4 by NurglesGift (on 11. April 2025, 06:00) | 92 | 96 % |
| Invisible Cages by Big Tiger (on 25. March 2021, 10:42) | 28 | 96 % |
| Loop with a Coral Infestation by KNT (on 20. August 2023, 20:00) | 29 | 96 % |
| Fifth Wheel by IcyFruit (on 27. February 2025, 14:27) | 95 | 99 % |
| Adventskalender 2023, Türchen 9 - Glashochhäuser by Zzzyxas (on 9. December 2023, 07:00) | 52 | 99 % |
| Pentomino Schleifen (NFF) by Richard (on 8. October 2010, 12:00) | 28 | 92 % |
| Palindrome Madness by SirWoezel (on 2. June 2020, 18:26) | 25 | 94 % |
