(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 | |
|---|---|---|---|
 | Reuleaux (Arrow Sudoku X) by Ore (on 2. April 2022, 16:00) | 15 |  95 % |
| LM 2022 Leftover: Teilchenzoo by lupo (on 30. August 2022, 20:22) | 13 | 100 % |
| The Oculus by Ennead (on 1. October 2022, 18:06) | 14 | 94 % |
| Aqraf by CJK (on 24. October 2022, 19:49) | 34 | 94 % |
| Pleiades (S-Cell Mean Mini Sudoku) by Ambrose (on 6. January 2023, 18:29) | 12 | 94 % |
| Hybrid Star Battle Series (012) - Masyu by BenceJoful (on 26. March 2023, 16:31) | 29 | 94 % |
| Musical Renban by Mayamor (on 20. April 2023, 14:30) | 51 | 95 % |
| The Secret Meeting In Italy (German Whisper + XV) by Playmaker6174 (on 17. May 2023, 09:01) | 64 | 95 % |
| Croque Madame by Black_Doom (on 14. April 2024, 17:07) | 14 | 94 % |
| Cavino Royale (Canal View Nonogram) by PrimeWeasel (on 22. April 2024, 09:23) | 31 | 99 % |
| Trisection by Andrewsarchus (on 16. July 2024, 06:27) | 14 | 92 % |
| Twin Killer Sudoku VI by Richard (on 29. August 2014, 12:00) | 80 | 96 % |
| Pinch Yourself (Killer Sudoku) by purpl (on 1. February 2022, 22:31) | 63 | 95 % |
| Dead Roman Miracle by Fool on Hill (on 30. July 2022, 11:26) | 74 | 95 % |
| Squishdomefel by Peter the Dog (on 9. December 2023, 10:22) | 56 | 94 % |
| LUSTIG - buntes Buchstabenrätsel / colorful letter puzzle by DocLogic (on 27. January 2021, 17:43) | 34 | 95 % |
| Gradius by Kafkapharnaum (on 20. May 2021, 15:23) | 43 | 94 % |
| PIRAT - Buchstabenrätsel / Letter puzzle by DocLogic (on 25. June 2021, 20:03) | 37 | 96 % |
| Mean Samurai by JayForty (on 9. January 2023, 17:11) | 78 | 96 % |
| Profusion (Yin Yang Killer) by troptot (on 14. February 2023, 19:07) | 37 | 94 % |
