(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 | |
|---|---|---|---|
 | Renban Arrow sudoku by udukos (on 2. June 2021, 22:13) | 39 |  96 % |
| Build Your Own Region Sums by Jay Dyer (on 23. January 2022, 20:27) | 37 | 99 % |
| 6x6 wrogn CC by lerroyy (on 6. June 2022, 00:07) | 39 | 94 % |
| Lying Japanese Cavescraper Ring by KNT (on 15. December 2022, 03:02) | 37 | 99 % |
| Richmond (Killer Diagonal) by tallcat (on 13. December 2022, 18:03) | 84 | 97 % |
| Wichtel 2018 (6): In der Wichtelbäckerei by wichtel (on 9. December 2019, 01:28) | 39 | 100 % |
| 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) | 40 | 92 % |
| Circle of Stars (Renban Quadruples) by Tyrgannus (on 4. April 2023, 21:33) | 47 | 92 % |
| Im Obstgarten (Sudoku) by glum_hippo (on 7. March 2024, 20:17) | 42 | 96 % |
| Dimorphism by Jay Dyer (on 19. April 2023, 10:34) | 85 | 97 % |
| Für pin7guin zum Geburtstag: Buchstaben-Kropki auf Magnetplatten by CHalb (on 6. September 2018, 23:58) | 40 | 99 % |
| Liar Japanese Sums #1 by Niverio (on 21. December 2022, 18:27) | 83 | 99 % |
| Roses by PulverizingPancake (on 20. May 2021, 22:55) | 47 | 99 % |
| Chaos FilloSudokumino by MagnusJosefsson (on 14. September 2022, 15:00) | 139 | 98 % |
| Xtravaganza (S-Cell XV Sudoku X) by tallcat (on 26. October 2022, 09:00) | 44 | 98 % |
| Twirl by SudokuExplorer (on 3. January 2023, 14:00) | 45 | 96 % |
| TapaS (the “S” is for SchrödingerS (that “S” is a typo)) by mathpesto (on 5. May 2023, 18:14) | 43 | 95 % |
| Is V Greater Than, Less Than, or Equal to 5? (Original) by HalfBakedLunatic (on 6. May 2024, 00:00) | 53 | 95 % |
| Inside by zetamath (on 13. October 2024, 19:05) | 49 | 97 % |
