(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 | |
|---|---|---|---|
 | Order of Yevon by Tyrgannus (on 30. May 2022, 12:50) | 17 |  90 % |
| LM 2022 Leftover: Teilchenzoo by lupo (on 30. August 2022, 20:22) | 14 | 100 % |
| The Oculus by Ennead (on 1. October 2022, 18:06) | 16 | 94 % |
| Happy Halloween! (Shifted X-sums 3) by Lizzy01 (on 27. October 2022, 19:48) | 15 | 94 % |
| X-Lines Sudoku by dennischen (on 19. February 2023, 20:21) | 15 | 92 % |
| Assume the Position by jwsinclair (on 2. March 2023, 20:45) | 33 | 96 % |
| Nothing's Funny (XV, Killer, Renban) by Chefofdeath (on 15. June 2023, 20:47) | 40 | 94 % |
| Colorguru Chaos Deconstruction: Arrows Edition by crispy16 (on 26. July 2023, 20:50) | 16 | 98 % |
| Find and Take Out The Killers by RockyRoer (on 19. September 2023, 03:17) | 49 | 97 % |
| Sphygmomanometer by ViKingPrime (on 15. January 2024, 17:00) | 16 | 96 % |
| Pseudo Differences by marty_sears (on 20. February 2024, 21:00) | 98 | 98 % |
| Ratsnake (Loop/German Whispers/Parity/X Sums) by damo_89 (on 19. August 2024, 13:06) | 16 | 92 % |
| Wheel of Killers by Prof.Dori (on 19. September 2024, 17:32) | 65 | 93 % |
| Copycat Mates by Scojo (on 28. October 2024, 02:33) | 18 | 90 % |
| Sudoku Variants Series (406) - Cold Arrows by Richard (on 10. January 2025, 12:00) | 99 | 94 % |
| Interphase (Cave/Nurikabe/Pentominoes) by dumediat (on 8. January 2026, 02:57) | 30 | 94 % |
| DSM Qualitraining 2021: Parity Party Sudoku by Realshaggy (on 16. January 2021, 06:00) | 52 | 96 % |
| Median Killer Sudoku by RockyRoer (on 11. June 2021, 14:00) | 51 | 98 % |
| Reban Arrow Sudoku by psninn (on 19. March 2024, 04:55) | 58 | 95 % |
| Twin Killer IV (B) by Richard (on 6. August 2010, 12:00) | 76 | 94 % |
