(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 | |
|---|---|---|---|
 | Nurimisaki Killer by Jay Dyer (on 27. March 2023, 18:51) | 58 |  98 % |
| Nurikabe and Chaos by wooferzfg (on 20. February 2023, 02:53) | 67 | 100 % |
| Overflow by IcyFruit (on 10. November 2023, 16:27) | 87 | 96 % |
| Field Lines by mathpesto (on 8. April 2023, 21:10) | 100 | 98 % |
| Parity Party VII — "Party Sandwiches" by glum_hippo (on 25. April 2020, 23:24) | 21 | 94 % |
| View Through The Window by SudokuExplorer (on 14. January 2021, 00:01) | 28 | 97 % |
| Tag 24 - Finale by CJK (on 20. February 2021, 14:48) | 46 | 97 % |
| Disjoint group little killer sudoku X by Lizzy01 (on 4. March 2021, 21:40) | 43 | 99 % |
| Paulas Geheimschrift-Rundweg-Puzzle by CJK (on 19. April 2021, 10:27) | 26 | 100 % |
| Parity Party XIX, "Kryppto" by glum_hippo (on 10. June 2021, 17:06) | 27 | 100 % |
| Chaosandwich by grkles (on 11. April 2022, 19:24) | 82 | 100 % |
| Deconstruction: Region Sums by Jay Dyer (on 24. April 2022, 22:14) | 52 | 98 % |
| Poltrona by ICHTUES (on 8. May 2022, 05:58) | 30 | 100 % |
| Biagonal Bichael (Chaos Construction) by purpl (on 29. May 2022, 17:32) | 35 | 98 % |
| The Unlikely Duos - A 6-pack Linked Sudokus Puzzle by Playmaker6174 (on 8. June 2022, 01:50) | 25 | 99 % |
| Hidden Full Rank by RockyRoer (on 25. June 2022, 14:45) | 39 | 100 % |
| My cup runneth over intensely by Fool on Hill (on 19. August 2022, 13:29) | 22 | 95 % |
| Coordinated Killers by Samish (on 11. September 2022, 09:09) | 62 | 96 % |
| Hook, Line and Sinker by SenatorGronk (on 29. September 2022, 00:21) | 19 | 92 % |
| Equilibrium 2: The Rune by Mad-Tyas (on 13. December 2022, 09:42) | 33 | 95 % |
