(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 | |
|---|---|---|---|
 | Whispering Negativity by yttrio (on 29. June 2024, 01:10) | 30 |  92 % |
| Enigma Sequence by XeonRisq (on 31. August 2024, 20:00) | 19 | 95 % |
| Cave Sudoku by Phistomefel (on 10. July 2020, 12:39) | 91 | 96 % |
| Long Island [Shimaguni Fillomino] by MicroStudy (on 5. May 2023, 01:11) | 54 | 97 % |
| Kill Or Quads by MSDOS (on 12. July 2024, 08:26) | 64 | 91 % |
| Horseshoes and Handgrenades by purpl (on 15. September 2021, 17:23) | 47 | 98 % |
| Drunken Knights by Blobz (on 8. July 2022, 16:00) | 58 | 93 % |
| Wichtel 2018 (10): HaHeHiHoHoHu by wichtel (on 7. February 2020, 18:20) | 37 | 100 % |
| Coriolis (Lockout X)(Tallcat and Twototenth Collab) by tallcat (on 30. January 2022, 20:56) | 41 | 95 % |
| Consecutive Steps by Scruffamudda (on 5. April 2023, 08:20) | 41 | 94 % |
| Segue Ursa by Prof.Dori (on 18. January 2024, 01:21) | 36 | 98 % |
| Skyscrapers Sudoku by Qodec (on 11. December 2021, 11:33) | 64 | 95 % |
| A Puzzle in Two Parts by jsmirob (on 12. December 2022, 05:58) | 78 | 95 % |
| Thermal Nights by abed hawila (on 24. April 2021, 20:29) | 169 | 98 % |
| 159 German Whispers Sudoku by Qodec (on 19. November 2021, 18:19) | 98 | 97 % |
| Three of a Kind / Deutsche: Drilling by apiyo (on 1. October 2020, 11:44) | 36 | 92 % |
| SLICY of Life by BenceJoful (on 2. December 2020, 00:48) | 28 | 100 % |
| Arrow Squaring [Killer, Arrow] by Miky (on 31. August 2021, 21:43) | 29 | 95 % |
| Van Helsing by the_cogito (on 8. February 2022, 17:40) | 27 | 97 % |
| Entropic Expansion by magnageas (on 25. September 2022, 23:05) | 30 | 98 % |
