(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 | |
|---|---|---|---|
 | [N]ine [B]oxes by Gliperal (on 14. July 2022, 09:20) | 19 |  90 % |
| Abstract Art (Equalines, Entropy) by Mad-Tyas (on 27. February 2023, 09:16) | 36 | 97 % |
| Chaos Construction: XY-Sums by ns08 (on 28. May 2023, 23:55) | 34 | 94 % |
| Crystallizer (Filloku #7) by mormagli (on 30. January 2024, 17:31) | 22 | 99 % |
| Foggy foggy x-sums by sanabas (on 26. July 2024, 07:36) | 44 | 94 % |
| Chocona Mall by Jay Dyer (on 16. August 2024, 21:19) | 23 | 93 % |
| Klein's Foggy Glasses by DubiousMobius (on 3. October 2024, 21:43) | 24 | 96 % |
| Bonsai (Ambiguous J-Sum Yin-Yang with Doublers) by MaizeGator (on 19. November 2024, 22:45) | 33 | 100 % |
| Orbit by Qodec (on 16. September 2020, 21:38) | 71 | 99 % |
| Chaos Construction: Numbered Rooms / Skyscraper / Sandwich Length by KNT (on 4. May 2022, 07:54) | 54 | 97 % |
| River Crossing by IcyFruit (on 22. February 2024, 14:37) | 88 | 98 % |
| Zag by grkles (on 18. March 2021, 11:46) | 46 | 98 % |
| Halligen Knapp Daneben by KNT (on 12. January 2023, 01:08) | 34 | 97 % |
| The Turtle (Renban, Entropy) by Mad-Tyas (on 28. March 2023, 09:21) | 38 | 98 % |
| Japanese Sums Narrow Cave Cipher: Mirrors (11x11) by Jesper (on 2. June 2023, 16:04) | 35 | 100 % |
| A Rose by PotatoHead21 (on 2. August 2023, 08:24) | 35 | 95 % |
| Knights Mate by blackjackfitz (on 17. January 2024, 20:52) | 43 | 95 % |
| Second Rodeo (collab. with Tallcat) by jwsinclair (on 17. October 2024, 23:06) | 66 | 98 % |
| Roller Coaster mit Extras 25 by Uhu (on 5. March 2022, 08:36) | 24 | 99 % |
| Sunken Treasure Chaos Construction by Schwupel (on 24. July 2022, 18:58) | 26 | 97 % |
