(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 | |
|---|---|---|---|
 | Death Stare by Die Hard (on 5. February 2023, 21:21) | 27 |  93 % |
| 1918 by starwarigami (on 19. October 2023, 11:29) | 51 | 96 % |
| King's Siege by Sniglett (on 10. March 2024, 23:05) | 26 | 95 % |
| Schlangen im Fillomino-Nest II by tuace (on 3. March 2017, 11:24) | 36 | 99 % |
| Hidden Sums by jwsinclair (on 27. November 2021, 20:19) | 36 | 97 % |
| As My Guitar Gently Sweeps by Andrewsarchus (on 22. December 2021, 08:42) | 36 | 95 % |
| Renmometers by Jeet Sampat (on 1. June 2022, 21:50) | 44 | 92 % |
| Levity by Emphyrio (on 29. October 2022, 09:51) | 47 | 94 % |
| Halligen by KNT (on 8. January 2023, 07:48) | 39 | 98 % |
| Intergrowth (Psycho Look-and-Say/Entropic lines/Modular lines) collab with bellsita by dumediat (on 25. February 2023, 12:51) | 43 | 99 % |
| Stepping Stone Sandwiches by RockyRoer (on 1. April 2024, 18:36) | 39 | 95 % |
| Sprawling by Xenonetix (on 14. April 2024, 01:01) | 39 | 96 % |
| Lion (Non-touching killer sudoku) by Qodec (on 18. May 2022, 11:58) | 107 | 94 % |
| Roller Coaster Krypto by Uhu (on 11. November 2016, 13:47) | 54 | 98 % |
| Knight Fever by apiyo (on 31. January 2021, 03:19) | 60 | 96 % |
| Snakomino [Level #1] by Christounet (on 1. February 2023, 22:17) | 58 | 100 % |
| Cacophony by zetamath (on 5. August 2021, 18:19) | 90 | 96 % |
| Tetrakiller by Jay Dyer (on 31. May 2022, 15:17) | 86 | 98 % |
| sphinx of black quartz by aqjhs (on 4. October 2024, 01:40) | 94 | 95 % |
| Die Kryptos - S03E05: Spiral City Construction by tuace (on 30. October 2018, 10:14) | 49 | 98 % |
