(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 | |
|---|---|---|---|
 | Feeling Left Out by RockyRoer (on 10. February 2021, 11:57) | 18 |  94 % |
| Distant Relations #2 by Big Tiger (on 13. March 2021, 06:27) | 16 | 94 % |
| Caught Between Enemy Lines by Playmaker6174 (on 14. August 2021, 10:07) | 27 | 95 % |
| FourCast (Hidden Arrow Sudoku) by Nordy (on 13. December 2021, 05:52) | 45 | 99 % |
| _234_678_ by twototenth (on 22. February 2022, 08:00) | 48 | 92 % |
| Reuleaux (Arrow Sudoku X) by Ore (on 2. April 2022, 16:00) | 18 | 96 % |
| Smashboy by mathpesto (on 31. July 2022, 20:12) | 74 | 94 % |
| Production Line by starwarigami (on 12. August 2022, 11:41) | 53 | 94 % |
| Whispering Rain by JeremyDover (on 14. August 2022, 23:59) | 26 | 94 % |
| Spindrift by SeveNateNine (on 1. January 2023, 02:49) | 21 | 91 % |
| Pentopia by au voleur! (on 14. February 2023, 02:04) | 69 | 92 % |
| Switch by fuxia (on 12. March 2023, 01:13) | 60 | 94 % |
| Dragon Ball Soup by meggen033 (on 18. May 2023, 08:10) | 31 | 93 % |
| Glider Gun [Akari RGB] by wisty (on 13. October 2023, 14:46) | 28 | 90 % |
| Copperhead (German Whisper Snake) by Video Floral (on 22. November 2023, 15:17) | 19 | 100 % |
| High-Rise Whisper Loop by yttrio (on 15. June 2024, 02:24) | 25 | 95 % |
| ShatteredSudoku by DubiousMobius (on 1. August 2024, 18:32) | 29 | 90 % |
| Water From A Stone by Biscuit (on 26. August 2024, 18:07) | 45 | 93 % |
| Region Sum and Renban lines by psninn (on 27. September 2024, 20:29) | 72 | 91 % |
| Galactic Orbit by Sniglett (on 10. March 2025, 00:32) | 21 | 98 % |
