(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 | |
|---|---|---|---|
 | H-Bomb by Abdul the Killer (on 30. April 2024, 12:34) | 35 |  93 % |
| Castle Woku (Castle Wall/Sudoku) by Wessel Strijkstra (on 16. December 2022, 16:49) | 36 | 99 % |
| Schrödinger 201: Reversing Time's Arrow by ViKingPrime (on 20. September 2023, 01:00) | 31 | 94 % |
| The Sword by Qodec (on 22. November 2020, 19:59) | 67 | 97 % |
| Snake Sum Sudoku 1 by Quarterthru (on 26. June 2020, 16:44) | 32 | 98 % |
| 真笑Puzzles013--Chaos Construction--“庄子” 004 by cdwg2000 (on 9. January 2021, 05:05) | 25 | 99 % |
| Denominators by AnalyticalNinja (on 29. January 2024, 00:30) | 24 | 99 % |
| Chaos Construction - Border Relations by Niverio (on 3. May 2024, 12:35) | 86 | 97 % |
| Laser (1) by Uhu (on 26. October 2020, 10:30) | 21 | 97 % |
| Hungarian Tapa-Like Loop by the_cogito (on 28. April 2023, 19:16) | 23 | 91 % |
| Sliced Chaos Production by RockyRoer (on 27. November 2022, 12:37) | 43 | 98 % |
| Equilibrium by Xendari (on 18. August 2022, 14:04) | 62 | 98 % |
| Just One Cells Sudoku(WS+PC2021 Leftover) by cdwg2000 (on 24. November 2021, 06:35) | 23 | 94 % |
| Ƨ Slithering Loop Ƨ by ElChiglia (on 14. October 2023, 08:05) | 41 | 91 % |
| Cave / Stations by KNT (on 12. December 2023, 18:15) | 81 | 99 % |
| Schirmflechte Krypt by Luigi (on 25. August 2009, 11:14) | 30 | 90 % |
| Recombination by Jay Dyer (on 11. October 2021, 20:05) | 18 | 96 % |
| [50 Puzzles Celebration] Double Trouble Entropy by Mad-Tyas (on 30. January 2022, 03:49) | 30 | 100 % |
| Disjointed Cube by antiknight (on 11. May 2022, 22:38) | 18 | 90 % |
| Cherry Picking (Arrow Sudoku) by Sktx (on 25. September 2022, 17:49) | 33 | 96 % |
