(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 | |
|---|---|---|---|
 | Shady Fillomino by Agent (on 18. June 2024, 09:00) | 49 |  97 % |
| Fishnet by TotallyNormalCat (on 22. February 2022, 02:30) | 91 | 97 % |
| Missing Quads by antiknight (on 28. June 2022, 19:05) | 42 | 93 % |
| 6 Arrows by Jeet Sampat (on 25. September 2022, 22:46) | 41 | 97 % |
| Polymorphic Chaos by thoughtbyte (on 22. August 2023, 13:53) | 71 | 98 % |
| The Big One by IcyFruit (on 25. January 2024, 14:04) | 44 | 95 % |
| Yozzy by zetamath (on 6. May 2024, 02:28) | 41 | 95 % |
| Ready For Launch by Niverio (on 7. May 2024, 10:19) | 42 | 95 % |
| Arrows Usually Include Low Digits by Md88keys (on 2. December 2025, 01:11) | 70 | 95 % |
| Extreme Lunchbox by Undar_Beyond (on 15. May 2020, 20:32) | 33 | 90 % |
| Skyscrapers 10x10 by pandiani42 (on 6. August 2020, 12:42) | 28 | 93 % |
| Adventskalender 2023, Türchen 21 - Lügende Passierscheine by Zzzyxas (on 21. December 2023, 07:00) | 27 | 98 % |
| U-Bahn with Extra Regions by wooferzfg (on 2. July 2024, 07:46) | 27 | 96 % |
| 4 Line Theorem by Manta-Ray (on 19. December 2025, 22:56) | 58 | 99 % |
| A Third Loop by mathpesto (on 24. August 2023, 02:34) | 50 | 99 % |
| Tête-á-tête (Between Line Nabner) by tallcat (on 11. September 2023, 08:00) | 53 | 95 % |
| WPC 2016 Training - Pentominos by uvo (on 12. July 2017, 15:33) | 39 | 98 % |
| Palindrome Killer Sudoku by udukos (on 8. August 2020, 23:02) | 41 | 94 % |
| Antiknight Between Lines by Gliperal (on 12. May 2021, 04:19) | 42 | 97 % |
| Witchcraft by PotatoHead21 (on 25. November 2021, 21:56) | 39 | 98 % |
