(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 | |
|---|---|---|---|
 | Oil, Water, Whisper by Blobz (on 22. July 2024, 16:00) | 154 |  96 % |
| Combi Windoku by Richard (on 23. July 2009, 09:57) | 123 | 92 % |
| Prime whispers sudoku (aka "Prime line sudoku") by ibn Muhyiddin (on 4. July 2020, 16:32) | 59 | 96 % |
| Dropsies by RockyRoer (on 12. September 2020, 12:01) | 90 | 97 % |
| Overlapping Notes (Double digit thermometer sudoku) by Aspartagcus (on 28. August 2021, 21:13) | 29 | 98 % |
| Patchwork by steelwool (on 11. October 2022, 18:00) | 29 | 94 % |
| SINIS by ICHTUES (on 16. October 2022, 06:00) | 34 | 96 % |
| K⁴NQ⁴ by DarthParadox (on 11. November 2022, 08:24) | 38 | 91 % |
| Waterworld by Palfly Kampling (on 16. June 2023, 02:37) | 29 | 92 % |
| One Loop, Two Loop by Belamis (on 21. July 2024, 11:48) | 38 | 96 % |
| Ringban Octopus by ThePedallingPianist (on 22. August 2024, 14:23) | 31 | 94 % |
| Pealomino by palpot (on 11. November 2025, 06:00) | 43 | 99 % |
| Whirlwind by SamuPiano (on 2. January 2024, 22:00) | 61 | 98 % |
| Diagonal-Windoku by ibag (on 29. December 2011, 20:09) | 65 | 95 % |
| Pentomino-Hitori by tyskhubi (on 2. August 2014, 09:41) | 32 | 92 % |
| Ramparts by SSG (on 11. October 2021, 12:15) | 18 | 90 % |
| Seventh Night by SSG (on 1. December 2021, 07:07) | 67 | 93 % |
| Phone in your Crossword Puzzle By Olima and PanthChesh by panthchesh (on 8. March 2022, 04:09) | 16 | 90 % |
| The Average Sudoku 2 by Lyun Licuss (on 12. September 2022, 05:39) | 18 | 93 % |
| Aqraf by CJK (on 24. October 2022, 19:49) | 37 | 94 % |
