(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 | |
|---|---|---|---|
 | Little Miracle by Prof.Dori (on 13. May 2024, 18:26) | 97 |  97 % |
| Ignorant Killer Sudoku - Part 2 by ProwlingTiger (on 12. May 2020, 23:10) | 17 | 98 % |
| NonoSums by Mark Sweep (on 4. October 2020, 20:41) | 17 | 98 % |
| Exploded Compass Sudoku by stephane.bura (on 28. February 2021, 09:00) | 15 | 98 % |
| Think outside the snake by filuta (on 25. June 2022, 21:13) | 46 | 96 % |
| Cave Battle (15x15) by Jesper (on 20. March 2023, 16:00) | 46 | 99 % |
| Japanese Sums #2: Balance by Myxo (on 26. April 2023, 21:10) | 46 | 97 % |
| Badminton (Parity mirror sudoku with arrows and diagonal) by Qodec (on 5. August 2023, 01:12) | 74 | 96 % |
| Nine in the Afternoon by Neokart (on 9. September 2024, 13:00) | 17 | 92 % |
| at the vortex spot by aqjhs (on 2. October 2025, 23:58) | 14 | 96 % |
| Ultramarathon by oklux (on 24. November 2025, 17:37) | 14 | 92 % |
| Varianten-Samurai-Sudoku by JonaS2010 (on 9. September 2018, 09:09) | 56 | 98 % |
| Return of the killer tomatoes (Shikaku killer) by PrimeWeasel (on 7. January 2024, 17:32) | 36 | 94 % |
| Archers and Kings by SudokuExplorer (on 30. March 2021, 01:00) | 79 | 97 % |
| Exums by Xenonetix (on 27. May 2022, 22:22) | 46 | 99 % |
| Council Bluffs by glum_hippo (on 23. June 2023, 14:19) | 61 | 98 % |
| 2024 Chaotic X-Sums by Florian Wortmann (on 10. January 2024, 19:23) | 119 | 98 % |
| 真笑Puzzles013--Chaos Construction--“庄子” 004 by cdwg2000 (on 9. January 2021, 05:05) | 32 | 98 % |
| Drumsticks by antiknight (on 18. May 2022, 12:01) | 36 | 93 % |
| Clockwork (Sum-Product Frame Sudoku) by Qodec (on 16. December 2025, 21:19) | 37 | 98 % |
