(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 | |
|---|---|---|---|
 | Monster Math by ThePedallingPianist (on 26. October 2023, 02:40) | 33 |  100 % |
| Ziemlich japanische Summen mit Irrwisch by ibag (on 10. June 2017, 10:00) | 27 | 99 % |
| Locust [Kropki Killer Sudoku] by Panthera (on 12. December 2020, 13:00) | 31 | 93 % |
| ✚ Whisper-me-Sum-thing Loop ✚ by ElChiglia (on 9. December 2023, 07:15) | 32 | 90 % |
| In Chaos there is Order by Ali M (on 15. March 2024, 21:55) | 31 | 92 % |
| Fifteen by Die Hard (on 20. March 2024, 00:27) | 26 | 98 % |
| Constance by lerroyy (on 17. May 2024, 11:20) | 29 | 100 % |
| Chaos Construction: Liar Japanese Sum (9x9) by Playmaker6174 (on 22. August 2025, 23:00) | 28 | 100 % |
| Rätselsuppe III by Luigi (on 30. June 2010, 08:04) | 78 | 97 % |
| Archers and Knights by SudokuExplorer (on 23. March 2021, 01:00) | 101 | 98 % |
| The Final Fourteen by FryTheGuy (on 20. October 2021, 05:38) | 29 | 96 % |
| Wordless Kakuro by qiuyanzhe (on 26. November 2021, 08:34) | 23 | 90 % |
| Chaos by Nahileon (on 26. February 2022, 19:06) | 25 | 98 % |
| The Postman Problem by ThePedallingPianist (on 6. July 2023, 13:16) | 25 | 100 % |
| Vampires Magnet Butterfly by damasosos92 (on 15. April 2024, 16:40) | 28 | 93 % |
| Push and Pull by arbitrary (on 29. August 2024, 00:54) | 47 | 97 % |
| It Takes a Village by lmdemasi (on 25. September 2024, 01:09) | 43 | 96 % |
| Fillomino Aquarium by Phistomefel (on 16. January 2022, 00:44) | 90 | 100 % |
| Chaos Construction: Slingshots by Piatato (on 26. January 2025, 00:45) | 72 | 97 % |
| A Powerful Duo (Entropy, Anti-Knight) by Mad-Tyas (on 16. May 2023, 09:08) | 47 | 95 % |
