(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 | |
|---|---|---|---|
 | Triple Japasu III by Luigi (on 27. April 2018, 08:10) | 53 |  94 % |
| Adventskalender 2020, Türchen 12 - Landvermessung by Zzzyxas (on 12. December 2020, 07:00) | 62 | 97 % |
| Grasshoppers and Horseshoes by antiknight (on 7. March 2022, 23:06) | 23 | 95 % |
| Double Arrows Arrows by Samish (on 24. September 2022, 10:09) | 17 | 92 % |
| Cycle Four by Big Tiger (on 24. June 2023, 09:11) | 18 | 92 % |
| Serpent's Lair (Magic Labyrinth, Snake, Renban, Anti-consecutive) by Chilly (on 13. January 2024, 18:06) | 15 | 96 % |
| Copycat Cipher by Scojo (on 12. August 2024, 19:20) | 17 | 98 % |
| five boxing wizards by aqjhs (on 6. January 2025, 07:53) | 51 | 92 % |
| Loopy Circles by Scojo (on 9. September 2025, 22:33) | 78 | 98 % |
| Antithetical slayer by NicoD (on 10. February 2026, 05:30) | 17 | 97 % |
| Chaos Construction: Y-Sums by KNT (on 2. March 2026, 17:04) | 85 | 99 % |
| Confluence 2: Dumediat Birthday Edition by mathpesto (on 31. August 2023, 17:41) | 66 | 100 % |
| Haywire by mathpesto (on 5. September 2024, 22:21) | 47 | 97 % |
| Glückwünsche vom Orion by Statistica (on 9. July 2019, 00:55) | 25 | 100 % |
| Double, Double by zetamath (on 13. August 2022, 22:07) | 93 | 97 % |
| Amphiboly by SSG (on 14. October 2022, 05:42) | 28 | 100 % |
| Antiknight Killer Sudoku 2 by PotatoHead21 (on 6. November 2022, 01:25) | 33 | 91 % |
| Arrows by psninn (on 13. May 2024, 13:03) | 30 | 92 % |
| Costco Run: Mixed Nuts, Bananas, Sudoku? (4,14) by Scojo (on 1. February 2025, 11:34) | 27 | 98 % |
| Four-Color Yajilominous by Nell Gwyn (on 19. July 2025, 04:13) | 33 | 98 % |
