(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 | |
|---|---|---|---|
 | Castle Wall / Masyu Liars by Agent (on 24. January 2023, 09:00) | 39 |  99 % |
| City of Nomura (Zipper Lines/Skyscraper) by Tyrgannus (on 27. July 2025, 03:21) | 31 | 92 % |
| More Drunken Knights by Blobz (on 9. September 2022, 16:00) | 107 | 96 % |
| Sum Set Sudoku by Genomico (on 11. May 2021, 00:00) | 26 | 99 % |
| Beep Beep (Killer/German Whispers/Renban/Between Lines) by dumediat (on 18. May 2022, 23:28) | 31 | 93 % |
| Parity Sum Lines Sudoku by Agent (on 16. August 2022, 09:00) | 52 | 96 % |
| Masyudoku (Masyu/Latin Square/Loop Sums/Ambiguity) by dumediat (on 30. September 2022, 02:35) | 22 | 95 % |
| Distorted Reflections by meggen033 (on 10. March 2024, 14:46) | 68 | 94 % |
| 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 % |
| Polysemy (Castle wall/Masyu/Knapp daneben) by dumediat (on 23. August 2025, 13:56) | 27 | 100 % |
| 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 % |
| Killomino by josh_johnson (on 9. July 2022, 04:16) | 48 | 93 % |
| Nos482 by starwarigami (on 27. November 2024, 01:51) | 45 | 93 % |
| Mislabeled Killers by CaptZebraCakes (on 27. June 2024, 04:35) | 142 | 98 % |
| Numbered Walls by Niverio (on 21. July 2022, 23:57) | 72 | 100 % |
| Dead Roman Miracle by Fool on Hill (on 30. July 2022, 11:26) | 84 | 95 % |
| UNPROBLEMATISCH - Buchstabenrätsel by DocLogic (on 1. January 2020, 13:06) | 48 | 92 % |
| Anti-Knight, Arrows, Killer Cages, and Kropki Dots by Jeet Sampat (on 31. October 2021, 01:11) | 39 | 92 % |
