(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 | |
|---|---|---|---|
 | ☯ Yin-Yang-Loop ☯ by ElChiglia (on 1. April 2024, 00:17) | 28 |  93 % |
| Another “One of These Things” by Jrosas (on 4. April 2024, 16:47) | 20 | 91 % |
| Mysterious Puzzle Survey by Niverio (on 8. July 2024, 01:00) | 10 | 95 % |
| Double-wrapped X-sums by sanabas (on 19. July 2024, 04:58) | 12 | 90 % |
| double negative by arctan (on 24. September 2024, 22:02) | 24 | 95 % |
| Triad by Andrewsarchus (on 22. December 2024, 15:18) | 14 | 93 % |
| Stolen Numerals XVII-5 by NurglesGift (on 16. January 2025, 16:48) | 55 | 96 % |
| GPS Signal Lost by ChinStrap (on 16. February 2025, 18:31) | 16 | 95 % |
| Sharing Is Caring by ThePedallingPianist (on 5. January 2024, 02:59) | 111 | 96 % |
| Roller Coaster mit Extras by Uhu (on 26. December 2017, 14:22) | 68 | 97 % |
| Color Palette by Joseph nehme (on 18. December 2022, 10:14) | 124 | 96 % |
| Wichtel 2011 (2): Ein Sack voller Flöhe by wichtel (on 12. January 2012, 09:00) | 54 | 98 % |
| Quadrupelblock für Gabi by pin7guin (on 9. July 2015, 21:56) | 48 | 96 % |
| Zodiac Project: Gemini by Christounet (on 19. September 2024, 13:18) | 99 | 98 % |
| Six-pack Linked Sudokus #2 by Genomico (on 4. October 2020, 16:49) | 52 | 98 % |
| Pencil puzzle sudoku hybrid series #2 - Hashiwokakero sudoku by Aspartagcus (on 6. November 2020, 11:25) | 52 | 97 % |
| This and That by CaptZebraCakes (on 17. June 2023, 17:54) | 57 | 98 % |
| Squiggles by Ratfinkz (on 30. November 2024, 20:38) | 47 | 97 % |
| Killer Sudoku by abed hawila (on 30. March 2021, 12:58) | 43 | 93 % |
| Memory Loss by Joseph nehme (on 25. December 2021, 10:45) | 39 | 92 % |
