(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 | |
|---|---|---|---|
 | Secrets and Lines by starwarigami (on 2. November 2021, 19:23) | 78 |  96 % |
| Killer Ambiguity by abed hawila (on 8. February 2022, 00:34) | 45 | 97 % |
| Repeater by mathpesto (on 19. March 2022, 04:47) | 58 | 97 % |
| Progressive Divisors by DiMono (on 3. April 2022, 21:10) | 50 | 96 % |
| Ghost by Jay Dyer (on 13. April 2022, 15:50) | 27 | 97 % |
| Imaginary Cages by brandon_bot (on 1. May 2022, 21:14) | 31 | 98 % |
| Full Rank Sandwich by RockyRoer (on 5. June 2022, 03:22) | 60 | 100 % |
| Build Your Own Killer: High Pressure by Playmaker6174 (on 14. September 2022, 22:27) | 44 | 100 % |
| The Devil's Cage by TinkerTroy (on 3. October 2022, 18:36) | 41 | 96 % |
| Squbler's 100 by mormagli (on 18. October 2022, 02:39) | 38 | 95 % |
| Colossal Cave Sudoku by tesseralis (on 28. October 2022, 03:02) | 74 | 99 % |
| Japanese Sums Nurikabe Arrows (9x9) by Xendari (on 1. January 2023, 08:55) | 17 | 95 % |
| The 2-Colour Theorem by starwarigami (on 17. February 2023, 08:46) | 68 | 92 % |
| Broken Entropy by SeveNateNine (on 23. March 2023, 00:46) | 18 | 96 % |
| Points 'round by damasosos92 (on 18. April 2023, 20:01) | 17 | 91 % |
| Anti Minesweeper Chaos by Polycarp (on 29. April 2023, 20:24) | 33 | 93 % |
| Wichtel 2022 (1): Die Neue Karte von Krakatau by wichtel (on 22. June 2023, 08:08) | 16 | 96 % |
| Split Decision by ViKingPrime (on 30. August 2023, 04:42) | 24 | 97 % |
| On The Bottom Shelf (Nabner Modifier Sudoku) by Silverstep (on 9. September 2023, 00:24) | 17 | 95 % |
| Adventskalender 2023, Türchen 15 - Knapp daneben U-Bahn by Zzzyxas (on 15. December 2023, 07:00) | 30 | 94 % |
