(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 | |
|---|---|---|---|
 | Three Out of Four Ain't Bad by Big Tiger (on 12. July 2020, 22:00) | 38 |  95 % |
| Lying Japanese Cavescraper Ring by KNT (on 15. December 2022, 03:02) | 41 | 99 % |
| Unboxing (11x11 deconstruction) by jwsinclair (on 13. December 2024, 20:15) | 93 | 96 % |
| Wichtel 2018 (6): In der Wichtelbäckerei by wichtel (on 9. December 2019, 01:28) | 41 | 100 % |
| Renban Arrow sudoku by udukos (on 2. June 2021, 22:13) | 41 | 96 % |
| Bicycles by SirSchmoopy (on 27. September 2021, 05:19) | 40 | 98 % |
| Das Boot - GW and DW Sudoku by Mr.Menace (on 19. November 2021, 09:31) | 41 | 92 % |
| Sisyphos Fillomino (10x10) by Jesper (on 14. November 2022, 15:00) | 40 | 100 % |
| Steamed 'Bans (chaos construction with region sum clues) by SkepticalMario (on 5. September 2024, 00:00) | 87 | 97 % |
| Für pin7guin zum Geburtstag: Buchstaben-Kropki auf Magnetplatten by CHalb (on 6. September 2018, 23:58) | 40 | 99 % |
| Compass Fillomino #2 by MagnusJosefsson (on 8. April 2021, 18:35) | 47 | 97 % |
| Serial BoX by twototenth (on 23. November 2021, 08:00) | 47 | 96 % |
| Shindig Redone (Anti-Knight, Renban) by juddimal (on 4. January 2025, 00:43) | 103 | 98 % |
| Chaos Construction: Thermo Knots by Myxo (on 18. January 2025, 12:31) | 140 | 97 % |
| Chaos Deconstruction: Japanese Sum Cross the Streams Cipher by abed hawila (on 30. March 2023, 17:02) | 47 | 97 % |
| Framing In The Park by Niverio (on 14. April 2023, 19:33) | 43 | 96 % |
| Vice Versa (Region Sum Lines Sudoku) by Mr.Menace (on 23. June 2023, 09:30) | 95 | 93 % |
| Hole Lotta Lots (Black Hole) by gdc (on 14. November 2025, 15:14) | 46 | 97 % |
| Reticulated Python by mathpesto (on 27. March 2022, 04:58) | 95 | 97 % |
| Dimorphism by Jay Dyer (on 19. April 2023, 10:34) | 92 | 97 % |
