(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 | |
|---|---|---|---|
 | 1347 by Sktx (on 1. February 2022, 23:43) | 16 |  98 % |
| Suguru Chaos Deconstruction #5: Region Sums by mathpesto (on 23. March 2022, 01:51) | 99 | 98 % |
| Shockwaves by Jay Dyer (on 12. November 2022, 20:32) | 70 | 95 % |
| Wildflowers by mathpesto (on 28. May 2023, 18:09) | 71 | 95 % |
| Double? Or Nothing? [Doublers, Killer, Zeroers] by 3good5you (on 6. August 2023, 06:07) | 13 | 93 % |
| The Method of Differences by DarthParadox (on 16. December 2023, 21:06) | 27 | 95 % |
| Dorlightfully Devilish by ThePedallingPianist (on 2. November 2024, 20:11) | 13 | 95 % |
| The Light Maze (Chaos Construction, RGB) by Chilly (on 7. January 2025, 16:15) | 27 | 99 % |
| Rollercoaster Deconstruction by tallcat (on 3. April 2023, 20:36) | 58 | 97 % |
| Japanische Inseln, Krypto by pirx (on 28. February 2015, 17:00) | 28 | 99 % |
| Differenzen zwischen Summen III (kryptisch) by tuace (on 17. August 2018, 13:23) | 29 | 99 % |
| Bharatanatyam (2T1L CC) by Xenonetix (on 13. August 2022, 00:22) | 33 | 96 % |
| Halligen Knapp Daneben by KNT (on 12. January 2023, 01:08) | 29 | 100 % |
| Fillomino Chaos Construction by dennischen (on 23. May 2023, 08:46) | 62 | 100 % |
| Krop Kages by Philipp Huber (on 13. February 2021, 22:44) | 18 | 98 % |
| Modern Wall by XeonRisq (on 29. March 2023, 19:00) | 17 | 98 % |
| Nosferatu Crossfire by Mad-Tyas (on 14. January 2025, 08:02) | 16 | 92 % |
| Killer Sudoku by ahaupt (on 30. June 2020, 12:15) | 55 | 96 % |
| Sunken Treasure Chaos Construction by Schwupel (on 24. July 2022, 18:58) | 24 | 96 % |
| Mods, Quads, Odds & Schröds by ThePedallingPianist (on 17. October 2023, 15:00) | 32 | 97 % |
