(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 | |
|---|---|---|---|
 | Projected Cave by KNT (on 10. August 2024, 20:16) | 51 |  97 % |
| Dual Slitherlink by Phistomefel (on 8. May 2020, 11:09) | 63 | 97 % |
| Suguru Chaos Deconstruction: Zipper Lines by ONeill (on 24. December 2023, 04:34) | 71 | 99 % |
| Castle Wall Delta #1 (10x10) by Jesper (on 22. May 2021, 17:38) | 77 | 97 % |
| Ein JaTaHoKu by Statistica (on 27. October 2011, 15:00) | 67 | 97 % |
| The Devil's Arrows by Lisztes (on 22. February 2021, 01:00) | 24 | 96 % |
| Kropki Pairs Level III by Qodec (on 20. January 2021, 00:13) | 32 | 93 % |
| Imploded Compass Sudoku by stephane.bura (on 11. May 2021, 20:10) | 32 | 99 % |
| The Sailboat by Tom1i (on 23. August 2021, 12:44) | 28 | 99 % |
| Convergence by Stavros96 (on 29. September 2021, 12:02) | 15 | 98 % |
| Mixed Doubles by Scruffamudda (on 4. November 2021, 23:37) | 14 | 98 % |
| CHRISTBAUM - Buchstabenrätsel / Letter Puzzle by DocLogic (on 20. December 2021, 19:00) | 29 | 94 % |
| Position Sums Fillomino #2 by ONeill (on 23. October 2022, 05:47) | 31 | 99 % |
| Double Filtration by Jay Dyer (on 2. February 2023, 19:28) | 58 | 97 % |
| Thin Gloss by mnasti2 (on 30. May 2023, 20:50) | 26 | 93 % |
| 27x15 (2 in 1: Fillomino and Killer) by BenTen (on 15. October 2023, 02:10) | 16 | 98 % |
| Eye of Sauron by Xenonetix (on 23. October 2024, 23:23) | 26 | 90 % |
| Stationary Loop Deconstruction (1-7) by Playmaker6174 (on 18. February 2025, 08:00) | 47 | 100 % |
| Cipher JS(Aqre) Sudoku by Las4one (on 25. September 2025, 03:10) | 14 | 94 % |
| Antithetical slayer by NicoD (on 10. February 2026, 05:30) | 13 | 96 % |
