(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 | |
|---|---|---|---|
 | Cross Whispers by Fool on Hill (on 1. June 2023, 15:08) | 58 |  93 % |
| Zany Zipper Snake by starwarigami (on 15. February 2024, 00:00) | 28 | 92 % |
| Breach by vitaminz (on 16. May 2024, 00:15) | 21 | 97 % |
| Interlude (6 x 6 Puzzle Pack) by tallcat (on 25. July 2024, 08:00) | 20 | 93 % |
| Heat Intensity by Calesch (on 13. August 2024, 05:09) | 21 | 94 % |
| This or That - Killer Sudoku by Mr.Menace (on 31. August 2024, 19:22) | 60 | 92 % |
| Coloring Book #9: The Corridor by blackjackfitz (on 23. October 2024, 17:05) | 112 | 97 % |
| Dutch Flat Mates (Deconstruction X-Sums) (with Palpot) by Flinty (on 5. February 2025, 11:30) | 45 | 97 % |
| pollux by aqjhs (on 1. February 2025, 00:00) | 20 | 96 % |
| TLDR by Abdul the Killer (on 28. May 2024, 12:34) | 112 | 94 % |
| Sudoku Variants Series (303) - Assorted Sandwiches Sudoku by Richard (on 13. January 2021, 00:00) | 73 | 98 % |
| Burrows by jovi_al (on 18. July 2021, 03:38) | 71 | 96 % |
| Reversi by Wuschel (on 5. November 2023, 21:18) | 72 | 96 % |
| Ringban by Ridhwan (on 1. March 2023, 07:21) | 64 | 91 % |
| Anti-King Thermo Sudoku by Blashyrkh (on 26. January 2024, 16:35) | 62 | 95 % |
| Siamese Rundweg Sudoku Twins 6x6 by pokerke (on 11. December 2010, 21:40) | 48 | 99 % |
| Sudoku Variants Series (245) - Counting Neighbours Sudoku by Richard (on 4. December 2018, 00:00) | 99 | 92 % |
| BarQode Arrows (Renban Arrow) by tallcat (on 2. June 2021, 15:52) | 47 | 98 % |
| The Vs by ademjaz (on 12. October 2022, 00:19) | 55 | 93 % |
| Diamonds And Butterflies by Niverio (on 15. July 2023, 17:58) | 53 | 94 % |
