(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 | |
|---|---|---|---|
 | 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 % |
| 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 % |
| Unter der Lupe (Instructionless) by Myxo (on 27. September 2023, 10:20) | 44 | 96 % |
| Eye of Sauron by Xenonetix (on 23. October 2024, 23:23) | 26 | 90 % |
| e m p t y = c h a o s by aqjhs (on 28. December 2024, 06:15) | 72 | 98 % |
| Cipher JS(Aqre) Sudoku by Las4one (on 25. September 2025, 03:10) | 14 | 94 % |
| Doublarr by ICHTUES (on 9. March 2025, 06:00) | 79 | 98 % |
| Divide and Conquer by ebiggie (on 30. November 2025, 00:10) | 77 | 97 % |
| Gerade Ungerade Tapa-Höhle by tuace (on 7. December 2015, 12:20) | 49 | 99 % |
| Kakuro Series 6: Easy as Kakuro by Puzzle_Maestro (on 16. May 2020, 16:15) | 52 | 98 % |
| Snake-Sums Sudoku by Willy Wonka (on 18. September 2020, 17:40) | 44 | 99 % |
| Battle With The Archers 13: Unlucky Encounter by Playmaker6174 (on 27. August 2021, 19:14) | 37 | 96 % |
| Microchip by wooferzfg (on 23. July 2022, 02:19) | 39 | 97 % |
| Entropy Sweeper by tesseralis (on 30. September 2023, 22:40) | 74 | 96 % |
