(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 | |
|---|---|---|---|
 | Parity Sum Lines Sudoku by Agent (on 16. August 2022, 09:00) | 52 |  96 % |
| Candy Craze by Niverio (on 5. August 2023, 11:58) | 81 | 96 % |
| Heat Stroke by juggler (on 17. January 2024, 01:32) | 89 | 95 % |
| Take U-Turns by Black_Doom (on 20. March 2024, 04:35) | 52 | 96 % |
| Twister by Prof.Dori (on 22. May 2024, 14:06) | 54 | 91 % |
| Evolution by grkles (on 10. March 2023, 12:16) | 77 | 91 % |
| Rätselwochenende: Table for Four - Easy as Pentomino by uvo (on 26. November 2014, 16:40) | 39 | 93 % |
| Nos482 by starwarigami (on 27. November 2024, 01:51) | 45 | 93 % |
| Dutch Flat Mates (Product Ltd + Skyscrapers) by Crusader175 (on 19. March 2025, 11:30) | 45 | 96 % |
| Rundweg - Vertauschte Nachbarn by Calavera (on 28. June 2009, 13:47) | 74 | 93 % |
| Numbered Walls by Niverio (on 21. July 2022, 23:57) | 72 | 100 % |
| Corner Pockets by thoughtbyte (on 6. September 2022, 21:07) | 80 | 95 % |
| Sudoku Variants Series (275) - Confetti Sums Sudoku by Richard (on 1. July 2020, 00:00) | 110 | 99 % |
| 24 Rätsel in 24 Stunden (Teil 14) - Fillomino by Zzzyxas (on 24. June 2017, 13:24) | 85 | 92 % |
| UNPROBLEMATISCH - Buchstabenrätsel by DocLogic (on 1. January 2020, 13:06) | 50 | 92 % |
| Normal Lunchbox by Undar_Beyond (on 14. May 2020, 11:26) | 67 | 95 % |
| Anti-Knight, Arrows, Killer Cages, and Kropki Dots by Jeet Sampat (on 31. October 2021, 01:11) | 39 | 92 % |
| Order of Yevon by Tyrgannus (on 30. May 2022, 12:50) | 17 | 90 % |
| LM 2022 Leftover: Teilchenzoo by lupo (on 30. August 2022, 20:22) | 14 | 100 % |
| The Oculus by Ennead (on 1. October 2022, 18:06) | 16 | 94 % |
