(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 | |
|---|---|---|---|
 | Odd-Even Encoded Skyscraper Sums by glum_hippo (on 9. April 2025, 02:14) | 23 |  94 % |
| Parhelion by Shinya (on 2. September 2021, 00:09) | 73 | 99 % |
| Wichtel 2014 (9): Weihnachtsbaum by wichtel (on 19. March 2015, 01:24) | 39 | 99 % |
| Chicago by ICHTUES (on 29. August 2021, 06:00) | 43 | 97 % |
| Constructing a Murder Scene - Chaos Construction (Killer) by Mr.Menace (on 27. July 2022, 13:28) | 91 | 97 % |
| Peregrine (13x13 Chaos Deconstruction) by Xendari (on 30. April 2023, 16:27) | 46 | 100 % |
| Japanese Sums with Marked Cells (2) by KNT (on 13. February 2025, 22:30) | 39 | 97 % |
| Tonfa by Blashyrkh (on 14. April 2023, 09:41) | 39 | 95 % |
| Sackgassen by Myxo (on 15. August 2023, 05:27) | 36 | 96 % |
| Happy Birthday Bellsita: Supernatural Sums by wisty (on 26. September 2023, 10:13) | 16 | 97 % |
| Prismarine [Akari RGB] by wisty (on 16. October 2023, 09:10) | 19 | 97 % |
| Kakuro S-Cells Loop Knapp Daneben Jigsaw [Secret Satan #2] by Christounet (on 30. January 2024, 18:55) | 16 | 98 % |
| ZZZ-iii-PPP (Deconstruction 11x11) by SparkNights (on 12. February 2024, 06:00) | 16 | 100 % |
| Five Cage Jigsaw by RandyDan (on 29. January 2026, 18:55) | 19 | 90 % |
| Now the People Will Know We Were Here by ViKingPrime (on 17. April 2024, 16:15) | 49 | 98 % |
| Chaos Deconstruction: Position Sums by KNT (on 29. June 2022, 16:05) | 82 | 97 % |
| Fat X Little Killer Sudoku by Aspartagcus (on 31. August 2020, 10:20) | 33 | 95 % |
| Chaos Fillomino - Border Gaps #2 by Mark Sweep (on 21. December 2022, 10:00) | 33 | 99 % |
| Information Paradox (Advanced Black Hole) by heliopolix (on 6. May 2023, 01:38) | 29 | 100 % |
| Donuts by Die Hard (on 26. October 2023, 03:30) | 33 | 100 % |
