(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 | |
|---|---|---|---|
 | TDF Stage 1 by palpot (on 29. June 2024, 09:00) | 40 |  91 % |
| Nos482 by starwarigami (on 27. November 2024, 01:51) | 39 | 92 % |
| Tetronimo Kakuro by julius64 (on 26. April 2013, 18:12) | 46 | 93 % |
| Toroidal anti-knight sudoku by Shinya (on 1. May 2020, 11:12) | 23 | 94 % |
| Toroidal Chess Sudoku #2 by Rotstein (on 7. June 2020, 20:24) | 26 | 92 % |
| 2X45 by Lisztes (on 22. October 2021, 01:00) | 28 | 92 % |
| WYSI by brandon_bot (on 18. June 2021, 07:27) | 27 | 94 % |
| 真笑Puzzles048--Chaos Construction--Su Qin002 by cdwg2000 (on 23. March 2022, 12:24) | 22 | 99 % |
| Sandbox Mode [Irregular RSL Sudoku] by wisty (on 24. May 2022, 17:36) | 23 | 91 % |
| Build Your Own Killer: The Empty Box by Playmaker6174 (on 18. November 2022, 18:52) | 23 | 100 % |
| Build Your Own Sloopshot by mnasti2 (on 5. September 2023, 17:41) | 24 | 96 % |
| Go Kart Race by zegres (on 12. September 2023, 08:19) | 45 | 91 % |
| EntROPEy by Mad-Tyas (on 2. May 2024, 05:47) | 27 | 94 % |
| Loopy Whisper X-Sums by yttrio (on 8. June 2024, 04:31) | 78 | 98 % |
| Streuung by Myxo (on 24. July 2024, 13:27) | 61 | 92 % |
| Chaos Construction: Snake by Jay Dyer (on 14. January 2022, 19:55) | 30 | 98 % |
| That's Sum Slithering by andreasv (on 16. April 2022, 08:56) | 38 | 97 % |
| Trust Me, I'm Lying by Chefofdeath (on 23. June 2022, 02:39) | 34 | 93 % |
| Sudoku Variants Series (377) - Little Palindromes Sudoku by Richard (on 27. July 2022, 02:00) | 68 | 96 % |
| Adventskalender 2023, Türchen 24 - Masyukoralle by Zzzyxas (on 24. December 2023, 07:00) | 34 | 99 % |
