(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 | |
|---|---|---|---|
 | ⬯⬮⬯ Entropic-Sequence-Loop ⬮⬯⬮ (Easter Edition) by ElChiglia (on 30. March 2024, 07:15) | 23 |  92 % |
| Modern Art (Easter Special Edition) by Playmaker6174 (on 1. April 2024, 07:00) | 46 | 97 % |
| it said dry clean only by aqjhs (on 25. April 2025, 02:09) | 23 | 92 % |
| Starry starry grid - [BYO Yajilin] by damasosos92 (on 6. October 2025, 04:17) | 24 | 90 % |
| Liar Sudoku - Everything Is Wrogn by DiMono (on 18. September 2020, 19:23) | 99 | 99 % |
| Endleofan by NicoD (on 7. June 2025, 05:30) | 82 | 96 % |
| Only One Possible Solution Exists by Md88keys (on 4. September 2025, 04:51) | 85 | 94 % |
| Cage Scraper by glum_hippo (on 24. January 2021, 06:00) | 50 | 97 % |
| Double-Digit-Thermo I "The Tree" by Garford (on 23. January 2021, 19:04) | 55 | 96 % |
| In the Zoo by Qodec (on 21. February 2021, 19:50) | 51 | 90 % |
| Duplicates Somedoku by blackjackfitz (on 2. March 2024, 20:42) | 150 | 98 % |
| Slangen (ft. Dorlir) by Nordy (on 10. July 2024, 06:28) | 43 | 99 % |
| Thorny issues [German Whisper Deconstruction] by Christounet (on 17. February 2023, 23:36) | 91 | 97 % |
| Factor Attractor (Ratio Sudoku) by Volatility (on 28. July 2020, 03:10) | 46 | 96 % |
| Broken Ring by Lizzy01 (on 10. January 2021, 20:15) | 28 | 91 % |
| Sudoku Variants Series (300) - Killer Skyscrapers Sudoku by Richard (on 22. December 2020, 22:00) | 111 | 97 % |
| Parity Party XIV, "Avec cages" by glum_hippo (on 4. January 2021, 13:13) | 21 | 94 % |
| Pentominominous by emmettcito (on 22. May 2021, 18:51) | 21 | 99 % |
| Bent arrows by JoWovrin (on 19. June 2021, 13:20) | 44 | 96 % |
| SunSET Over The Pyramid by zegres (on 20. December 2021, 23:12) | 40 | 96 % |
