(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 | |
|---|---|---|---|
 | Dutch Flat Mates (Dorminoes) by Black_Doom (on 23. July 2025, 11:30) | 61 |  96 % |
| Fillomino 71 - Dedicated to Myxo by damasosos92 (on 23. August 2025, 19:52) | 17 | 98 % |
| Rituz Unicorno Unicorno XVI - Variation 2 by AJN (on 11. January 2026, 13:46) | 44 | 91 % |
| Stronger in Unity by Kafkapharnaum (on 15. January 2026, 19:50) | 19 | 98 % |
| Williwaw by NicoD (on 6. April 2026, 05:30) | 86 | 95 % |
| Sniper by NicoD (on 15. May 2026, 05:30) | 23 | 90 % |
| REDRUM by grkles (on 5. April 2021, 16:26) | 64 | 98 % |
| Black-dot Mamba by yttrio (on 10. November 2023, 20:55) | 105 | 98 % |
| Tenban by chrisjnap (on 14. September 2025, 17:51) | 48 | 97 % |
| Lake Goldajärvi by EdTheAlchemist (on 26. December 2025, 13:58) | 53 | 97 % |
| Differenz sudoku by Richard (on 8. May 2009, 17:00) | 134 | 90 % |
| March of the Spiders by Niverio (on 20. October 2021, 11:58) | 81 | 95 % |
| Double-Digit-Thermo III "The Ant nest" by Garford (on 10. February 2021, 17:55) | 35 | 99 % |
| Hybrid Star Battle Series (001) - Tapa-like Loop by BenceJoful (on 8. January 2023, 07:42) | 31 | 91 % |
| A Very Full Quiver by Oddlyeven (on 14. April 2023, 22:39) | 30 | 94 % |
| ▜▖Renbanimo Loop▗▛ by ElChiglia (on 30. December 2023, 07:15) | 32 | 96 % |
| Ben Nevis (Killer) by tallcat (on 30. December 2023, 13:50) | 106 | 97 % |
| SAT Sudoku (Quads and Anti-Quads) by RockyRoer (on 27. August 2021, 13:00) | 81 | 97 % |
| Table for Four - Battleship by uvo (on 19. August 2014, 12:27) | 42 | 97 % |
| Chroma-Some (Killer) by zegres (on 5. March 2024, 05:31) | 49 | 91 % |
