(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 | |
|---|---|---|---|
 | Spitting Image by Gene The Supreme (on 16. September 2024, 19:19) | 35 |  95 % |
| Renban Fillomino by MagnusJosefsson (on 26. March 2022, 14:01) | 76 | 98 % |
| Zipper Sandwich by RockyRoer (on 17. January 2024, 15:23) | 34 | 97 % |
| Vertigo Yajilin #1 by Piatato (on 10. April 2024, 00:37) | 27 | 99 % |
| 25/12 by starwarigami (on 26. December 2022, 21:15) | 64 | 91 % |
| Whose Doubler Is It Anyway? by ViKingPrime (on 23. August 2023, 12:30) | 61 | 97 % |
| MONSTER by Abdul the Killer (on 17. September 2024, 12:34) | 57 | 94 % |
| Godzilla in Sudokutown by FryTheGuy (on 21. September 2021, 05:35) | 55 | 98 % |
| Bridging The Mines by Florian Wortmann (on 7. December 2023, 20:20) | 181 | 95 % |
| Dotted around [Kropki Deconstruction] by Christounet (on 10. February 2023, 22:41) | 106 | 97 % |
| Entangled-2-Way-Sudoku by Rawcoder (on 11. May 2020, 18:07) | 25 | 94 % |
| 真笑Puzzles037--Chaos Construction-- “邹子”002 by cdwg2000 (on 2. April 2021, 15:51) | 22 | 94 % |
| Primescraper: Skysweeper by grkles (on 12. April 2021, 20:49) | 25 | 94 % |
| Check the corners by Stoer (on 18. April 2023, 15:13) | 32 | 90 % |
| Fleece (Killer, X-Sums) by Chefofdeath (on 12. August 2024, 06:33) | 30 | 93 % |
| Roadmap (Region Sum 159) by tallcat (on 2. December 2022, 15:49) | 77 | 94 % |
| Chaos Karussell VI by Luigi (on 16. September 2011, 10:15) | 49 | 94 % |
| Colorguru Chaos Deconstruction by crispy16 (on 30. May 2022, 03:09) | 47 | 97 % |
| Kropki Pairs and Palindromes by tenaliraman (on 23. January 2021, 21:42) | 31 | 91 % |
| Sandwiched Japanese Sums by leftovercube (on 29. December 2021, 21:38) | 22 | 96 % |
