(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 | |
|---|---|---|---|
 | Shanghai Skyline by Black_Doom (on 13. April 2025, 12:27) | 108 |  97 % |
| Black and White by zetamath (on 12. February 2021, 23:34) | 84 | 98 % |
| 14 Givens by lepton (on 4. February 2024, 04:34) | 105 | 96 % |
| Rose Killer Sudoku by SudokuExplorer (on 11. November 2021, 00:00) | 78 | 98 % |
| Snake in the City by Lizzy01 (on 28. November 2021, 14:24) | 41 | 95 % |
| Hidden X-Sums by RockyRoer (on 8. August 2022, 17:48) | 38 | 99 % |
| Taron [Fog of War] by IcyFruit (on 23. May 2024, 13:16) | 167 | 97 % |
| Consecutiveness by Niverio (on 1. August 2021, 11:47) | 55 | 95 % |
| Staggered by the_cogito (on 26. November 2021, 03:31) | 57 | 97 % |
| Bounds of Luck (Whisper MinMax) by tallcat (on 21. September 2022, 03:46) | 60 | 95 % |
| Yin-Yang Sudoku by Phistomefel (on 12. December 2020, 20:26) | 77 | 95 % |
| Stolen Numerals XV*3 by NurglesGift (on 6. July 2024, 22:12) | 75 | 95 % |
| Siamese Rundweg Sudoku Twins 6x6 by pokerke (on 11. December 2010, 21:40) | 50 | 99 % |
| Renban Pünktchen Spektakel by Luigi (on 27. June 2011, 13:10) | 30 | 95 % |
| 123... Schiffe versenken by lupo (on 23. May 2015, 00:00) | 30 | 93 % |
| Snake Sum Sudoku 6 by Quarterthru (on 15. July 2020, 20:00) | 19 | 98 % |
| Double Value Killer Sudoku by Willy Wonka (on 30. August 2020, 07:18) | 40 | 97 % |
| Divisible Cage Totals #2 (oops! no totals!) by RockyRoer (on 30. October 2020, 10:56) | 33 | 96 % |
| Juicebox by TotallyNormalCat (on 18. December 2020, 23:00) | 25 | 96 % |
| Four Killer Winds by Franjo (on 24. May 2021, 18:49) | 16 | 96 % |
