(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 | |
|---|---|---|---|
 | Entropic Loop Chaos by yttrio (on 9. February 2024, 19:28) | 81 |  96 % |
| Fireworks (Killer Arrow Sudoku) by FryTheGuy (on 2. June 2021, 07:12) | 19 | 91 % |
| Wanda's Hex by fjam (on 25. September 2021, 11:00) | 15 | 96 % |
| Jellyfish by grkles (on 15. October 2021, 01:49) | 25 | 98 % |
| Gridlock by FryTheGuy (on 14. November 2021, 01:13) | 22 | 98 % |
| Tight Fit by TotallyNormalCat (on 30. December 2021, 19:00) | 57 | 98 % |
| Sudoku O.W.L. by Nahileon (on 10. October 2022, 21:25) | 23 | 100 % |
| Crypto Japanese Cave (Fillomino) by KNT (on 5. November 2022, 16:24) | 48 | 98 % |
| Trimodi (Modifier Entropy) by Mad-Tyas (on 10. January 2023, 00:48) | 18 | 95 % |
| A Flock of Pixels (Colourful Killers) by The Book Wyrm (on 27. August 2023, 15:56) | 15 | 98 % |
| Wichtel 2022 (4): Traditionelle Japanische Summe by wichtel (on 20. September 2023, 11:11) | 15 | 100 % |
| Chaos Construction: Red Team / Blue Team by KNT (on 4. May 2024, 06:24) | 57 | 94 % |
| The Light Maze (Chaos Construction, RGB) by Chilly (on 7. January 2025, 16:15) | 34 | 99 % |
| Tetrafolium by Myxo (on 17. February 2025, 15:40) | 85 | 97 % |
| Hotel California by fjam (on 2. April 2025, 21:51) | 19 | 94 % |
| The Wandering Boi (Wrap Around, Chaos Construction) by DubiousMobius (on 24. July 2025, 00:38) | 26 | 100 % |
| Colossal Nurikabe Sudoku by Christounet (on 13. June 2023, 00:47) | 41 | 100 % |
| Japanese Sums #6: Volatility by Myxo (on 21. March 2024, 10:05) | 39 | 100 % |
| Loop Nurikabe by wooferzfg (on 2. February 2023, 16:31) | 108 | 99 % |
| Wichtel 2021 (4): Körbiks innere Ruhe by wichtel (on 27. July 2022, 22:01) | 30 | 93 % |
