(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 | |
|---|---|---|---|
 | Kakuro S-Cells Loop [Secret Satan #1] by Christounet (on 25. January 2024, 11:57) | 30 |  98 % |
| Council Bluffs by glum_hippo (on 23. June 2023, 14:19) | 56 | 98 % |
| District 9 by tesseralis (on 17. August 2022, 10:15) | 22 | 100 % |
| Indianapolis by ICHTUES (on 13. November 2022, 06:00) | 49 | 95 % |
| Irrwisch Sudoku: X-Sums by Gliperal (on 1. June 2023, 01:41) | 64 | 98 % |
| Little Miracle by Prof.Dori (on 13. May 2024, 18:26) | 88 | 97 % |
| Centroid by DarthParadox (on 24. May 2024, 17:57) | 22 | 90 % |
| Liar Japanese Sums #9 - Cave (Aqre) by Niverio (on 1. August 2024, 19:24) | 23 | 100 % |
| Nurikabe Sweeper Sudoku by KNT (on 23. May 2022, 01:37) | 55 | 100 % |
| Double Date [Doublers, Killer, Renban, Arrow collab with Tallcat] by Malrog (on 15. April 2024, 14:47) | 41 | 96 % |
| Badminton (Parity mirror sudoku with arrows and diagonal) by Qodec (on 5. August 2023, 01:12) | 71 | 96 % |
| Addierter Überlappungssudoku III by Richard (on 14. May 2010, 12:00) | 81 | 96 % |
| Ignorant Killer Sudoku - Part 2 by ProwlingTiger (on 12. May 2020, 23:10) | 15 | 98 % |
| Normal Lunchboxes 2 by Undar_Beyond (on 25. May 2020, 16:14) | 43 | 92 % |
| Exploded Compass Sudoku by stephane.bura (on 28. February 2021, 09:00) | 13 | 98 % |
| Pointed Knights by PotatoHead21 (on 3. March 2022, 08:30) | 45 | 95 % |
| Photonic Crystal Wings by heliopolix (on 14. October 2023, 02:47) | 17 | 100 % |
| Sega Cages by Prof.Dori (on 31. December 2023, 15:17) | 15 | 95 % |
| Horses are better in pairs by chameleon (on 12. April 2024, 11:47) | 27 | 93 % |
| Arrow Dynamics by PotatoHead21 (on 23. September 2024, 21:35) | 15 | 98 % |
