(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 | |
|---|---|---|---|
 | Wreathe (Dual Masyu/Yin Yang) by dumediat (on 3. March 2024, 00:00) | 45 |  98 % |
| Pathological by arbitrary (on 7. June 2024, 12:52) | 40 | 91 % |
| Some Balancing Product by Manta-Ray (on 9. November 2025, 12:36) | 82 | 96 % |
| Basket by Jay Dyer (on 10. October 2024, 23:37) | 130 | 98 % |
| Flaemmchen-Sudoku mit Einmischung der Außerirdischen by ibag (on 2. August 2013, 05:30) | 36 | 98 % |
| Paintball battle by Joseph nehme (on 26. December 2020, 18:04) | 44 | 96 % |
| Effective Field Theory by purpl (on 28. September 2021, 02:18) | 43 | 98 % |
| Kropki Chaos by mathpesto (on 23. January 2022, 04:19) | 87 | 97 % |
| Regicide by NicoD (on 26. June 2025, 05:30) | 46 | 94 % |
| Heartbreaking Bravery by juggler (on 1. October 2025, 23:08) | 41 | 90 % |
| Three Out of Four Ain't Bad by Big Tiger (on 12. July 2020, 22:00) | 40 | 95 % |
| Lying Japanese Cavescraper Ring by KNT (on 15. December 2022, 03:02) | 41 | 99 % |
| Fuzzy Doublers by Oddlyeven (on 24. August 2025, 19:03) | 38 | 93 % |
| Wichtel 2018 (6): In der Wichtelbäckerei by wichtel (on 9. December 2019, 01:28) | 41 | 100 % |
| Renban Arrow sudoku by udukos (on 2. June 2021, 22:13) | 42 | 96 % |
| Bicycles by SirSchmoopy (on 27. September 2021, 05:19) | 40 | 98 % |
| Das Boot - GW and DW Sudoku by Mr.Menace (on 19. November 2021, 09:31) | 42 | 92 % |
| RPG - The Enigma Trio by Playmaker6174 (on 24. December 2021, 16:30) | 43 | 96 % |
| Hyperdrive by Myxo (on 20. June 2023, 14:22) | 45 | 96 % |
| Für pin7guin zum Geburtstag: Buchstaben-Kropki auf Magnetplatten by CHalb (on 6. September 2018, 23:58) | 40 | 99 % |
