(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 | |
|---|---|---|---|
 | Taijitu (ft. KNT) by TotallyNormalCat (on 26. May 2022, 18:00) | 47 |  96 % |
| Verzwicktes ABCtje by ibag (on 23. October 2011, 09:42) | 21 | 93 % |
| Gridlock by FryTheGuy (on 14. November 2021, 01:13) | 18 | 99 % |
| Fillomino: Cryptic Differences #2 by Niverio (on 1. October 2022, 17:49) | 39 | 100 % |
| Dante's Chaotic Journey by SenatorGronk (on 7. July 2023, 04:16) | 20 | 100 % |
| Happy Birthday, Gabi!! by KNT (on 10. July 2023, 00:51) | 20 | 99 % |
| Chaos Deconstruction #3: Double Snake (11x9) by KNT (on 25. July 2022, 03:25) | 35 | 96 % |
| [Fog of War Series] 11.Misty Doublers by AstralSky (on 9. December 2022, 09:00) | 40 | 92 % |
| Suguru Chaos Deconstruction #5: Region Sums by mathpesto (on 23. March 2022, 01:51) | 87 | 98 % |
| Japanese Sum Cave Cipher #4: Twilight Cave Clues by KNT (on 23. October 2022, 06:02) | 46 | 99 % |
| Nabner Doubledeal by Jay Dyer (on 20. September 2023, 13:35) | 46 | 96 % |
| Riesenhochhäuser by Hausigel (on 4. December 2008, 23:54) | 104 | 97 % |
| On Repeat by mathpesto (on 14. March 2022, 01:14) | 54 | 100 % |
| Wildflowers by mathpesto (on 28. May 2023, 18:09) | 64 | 96 % |
| Fireworks (Killer Arrow Sudoku) by FryTheGuy (on 2. June 2021, 07:12) | 14 | 91 % |
| Pitchfork Emporium by FryTheGuy (on 21. December 2021, 04:10) | 25 | 94 % |
| 1347 by Sktx (on 1. February 2022, 23:43) | 14 | 98 % |
| Knotted Arrows by antiknight (on 20. April 2022, 22:34) | 28 | 91 % |
| Bharatanatyam (2T1L CC) by Xenonetix (on 13. August 2022, 00:22) | 25 | 95 % |
| 6 Puzzles, 6 Modifiers, 6 Digits by tesseralis (on 15. October 2022, 10:31) | 24 | 96 % |
