(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 | |
|---|---|---|---|
 | 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) | 33 | 93 % |
| Imploded Compass Sudoku by stephane.bura (on 11. May 2021, 20:10) | 33 | 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 % |
| Position Sums Fillomino #3: Internal Clues by ONeill (on 26. October 2022, 12:59) | 29 | 100 % |
| Double Filtration by Jay Dyer (on 2. February 2023, 19:28) | 59 | 97 % |
| Thin Gloss by mnasti2 (on 30. May 2023, 20:50) | 26 | 93 % |
| Doubling Down by antiknight (on 5. June 2023, 17:59) | 23 | 94 % |
| 27x15 (2 in 1: Fillomino and Killer) by BenTen (on 15. October 2023, 02:10) | 16 | 98 % |
| Suguru Chaos Deconstruction: Zipper Lines by ONeill (on 24. December 2023, 04:34) | 73 | 99 % |
| Eye of Sauron by Xenonetix (on 23. October 2024, 23:23) | 27 | 90 % |
| True Equality by Manta-Ray (on 4. October 2025, 15:01) | 16 | 92 % |
| Doublarr by ICHTUES (on 9. March 2025, 06:00) | 79 | 98 % |
| Prohibitive by jwsinclair (on 9. May 2025, 00:10) | 66 | 93 % |
| Coordinate Coordinate Arrows Arrows by damo_89 (on 3. January 2026, 12:20) | 64 | 96 % |
| Kakuro Series 6: Easy as Kakuro by Puzzle_Maestro (on 16. May 2020, 16:15) | 53 | 98 % |
| Snake-Sums Sudoku by Willy Wonka (on 18. September 2020, 17:40) | 44 | 99 % |
| Microchip by wooferzfg (on 23. July 2022, 02:19) | 39 | 97 % |
