(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 | |
|---|---|---|---|
 | Arrow Circus by PotatoHead21 (on 31. May 2023, 23:45) | 35 |  92 % |
| Killer Arrows by abed hawila (on 4. February 2021, 22:39) | 48 | 96 % |
| Lacunae (Sortadoku/Sandwich/Projected Sums) by dumediat (on 26. November 2023, 16:29) | 50 | 96 % |
| Dreiecksgalaxien II von MiR und mir by Luigi (on 13. July 2012, 09:40) | 14 | 93 % |
| X-Sums (Variant) by cdwg2000 (on 20. March 2021, 09:03) | 16 | 91 % |
| Pagoda by TotallyNormalCat (on 8. April 2021, 00:30) | 27 | 100 % |
| Heat Map by Scruffamudda (on 21. April 2022, 01:23) | 18 | 91 % |
| Hungarian Tapa-Like Loop by the_cogito (on 28. April 2023, 19:16) | 28 | 92 % |
| Revenge of the Fillometers by zzw (on 2. August 2023, 11:10) | 14 | 90 % |
| Two Twos and a Nine by ChinStrap (on 22. January 2025, 20:50) | 67 | 95 % |
| Sword of Ethereal Triumph (Parity/Zipper) by damo_89 (on 5. March 2026, 20:26) | 12 | 93 % |
| Parity Balance by zegres (on 12. October 2021, 04:51) | 45 | 96 % |
| Nonbinairo by mathpesto (on 28. May 2022, 22:53) | 47 | 98 % |
| Doppler Effect by Knickolas (on 1. February 2024, 00:14) | 47 | 96 % |
| The Mysterious Loop by Die Hard (on 15. November 2024, 04:51) | 44 | 95 % |
| Heranwachsende Rundwege by Calavera (on 27. November 2010, 20:38) | 54 | 99 % |
| Looking for Phisto by EPH (on 22. February 2023, 18:29) | 40 | 94 % |
| Grouping All but Two by Sneppix (on 22. April 2026, 11:47) | 36 | 95 % |
| Archers and Kings by SudokuExplorer (on 30. March 2021, 01:00) | 82 | 97 % |
| Overflow by TotallyNormalCat (on 7. March 2022, 21:00) | 108 | 97 % |
