(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 | |
|---|---|---|---|
 | Wail by mathpesto (on 25. February 2025, 17:26) | 81 |  95 % |
| "21" Partial Killer by Djmelee3000 (on 17. September 2020, 22:31) | 42 | 95 % |
| Chaos Construction: Snake by Jay Dyer (on 14. January 2022, 19:55) | 34 | 98 % |
| In The Middle of The Knight by Ridhwan (on 30. March 2023, 09:00) | 38 | 92 % |
| Adventskalender 2023, Türchen 24 - Masyukoralle by Zzzyxas (on 24. December 2023, 07:00) | 39 | 99 % |
| Squishtroquadri Snack Pack by ThePedallingPianist (on 5. December 2024, 12:25) | 38 | 95 % |
| Adventskalender 2020, Türchen 16 - Twilight-Höhle by Zzzyxas (on 16. December 2020, 07:00) | 71 | 99 % |
| Lasersummen (3) by BFaw (on 20. January 2012, 20:10) | 31 | 96 % |
| 真笑Puzzles038--Chaos Construction-- “韩非子” 003 by cdwg2000 (on 6. April 2021, 14:18) | 30 | 98 % |
| 159² by Sktx (on 2. September 2021, 01:17) | 28 | 94 % |
| Lines of the Banner by JeremyDover (on 29. January 2022, 14:11) | 38 | 95 % |
| Polychromatic by oklux (on 28. March 2022, 20:32) | 32 | 94 % |
| Reserved Parking (rush hour + variant sudoku) by rockratzero (on 30. April 2023, 10:58) | 68 | 93 % |
| Curious Consecutive Snake (by Paws and Ben) by starwarigami (on 19. January 2024, 11:45) | 38 | 95 % |
| Parity Renban by Oddlyeven (on 4. February 2023, 18:16) | 62 | 95 % |
| Fraction Party by sujoyku (on 12. September 2023, 19:46) | 63 | 97 % |
| 9x9 Fillomino Skyscrapers by Jesper (on 10. August 2020, 22:28) | 53 | 96 % |
| Square Wheel by twototenth (on 6. July 2021, 07:00) | 30 | 95 % |
| InTENtions UnkNown by Calvinball (on 16. February 2026, 03:46) | 26 | 96 % |
| Toroidal anti-knight sudoku by Shinya (on 1. May 2020, 11:12) | 25 | 91 % |
