(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 | |
|---|---|---|---|
 | Supercell by tesseralis (on 14. June 2022, 23:37) | 24 |  90 % |
| Deep sea weirdity (Between lines sudoku) by Lizzy01 (on 15. June 2022, 22:38) | 26 | 97 % |
| Hidden Full Rank by RockyRoer (on 25. June 2022, 14:45) | 42 | 100 % |
| Shading Sudoku Collection by KNT (on 10. August 2022, 05:09) | 43 | 97 % |
| Stronghold by fjam (on 31. May 2024, 19:04) | 23 | 93 % |
| thinking in square rooms by aqjhs (on 14. January 2026, 00:06) | 25 | 100 % |
| Try-ominos by damasosos92 (on 26. September 2024, 20:37) | 49 | 98 % |
| Same Old Same Old by MathGuy_12 (on 18. July 2025, 23:23) | 51 | 98 % |
| Fünf aßen Neun by MavericksJD (on 30. January 2022, 19:53) | 31 | 95 % |
| Where did the king go? by Jagga (on 20. August 2022, 16:04) | 29 | 91 % |
| Roman Hieroglyph by lepton (on 17. January 2023, 17:20) | 27 | 97 % |
| Matchaluck (A Meidjuluk N=15 Variant) by PrimeWeasel (on 11. October 2023, 11:41) | 28 | 100 % |
| Elementary by Christounet (on 18. September 2023, 22:30) | 55 | 98 % |
| Cave 20x20 by Strosahl (on 8. December 2020, 20:54) | 32 | 97 % |
| Quantum-safe sudoku by chameleon (on 26. September 2022, 20:11) | 31 | 91 % |
| Matty Didn't Call You Back Because He Had The Wrogn Number by Laake (on 26. September 2024, 22:11) | 95 | 96 % |
| Verspäteter Geburtstagsgruß aus dem All by ibag (on 27. June 2019, 00:00) | 30 | 99 % |
| Neural Network by Xenonetix (on 26. November 2022, 14:41) | 39 | 96 % |
| Yin-Yang Territories by masetab (on 3. January 2026, 13:01) | 74 | 100 % |
| Chaos Construction: X-Sums with Doublers by KNT (on 30. August 2022, 22:01) | 72 | 97 % |
