(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 | |
|---|---|---|---|
 | Memphis by ICHTUES (on 20. February 2022, 06:00) | 43 |  95 % |
| Edelweiß by loerting (on 27. December 2023, 23:20) | 53 | 95 % |
| Ominous Yajilin by Jay Dyer (on 23. June 2024, 21:12) | 42 | 95 % |
| YZ - XV by Scruffamudda (on 16. May 2023, 03:02) | 72 | 95 % |
| Wichtelkalender 2014 - Dezember: Der Weg des Weihnachtsmannes by Statistica (on 1. December 2014, 00:12) | 73 | 99 % |
| 4th of July Encrypted Thermo-Sandwich by Alexander Rappa (on 3. July 2020, 16:15) | 31 | 92 % |
| Three of a Kind / Deutsche: Drilling by apiyo (on 1. October 2020, 11:44) | 35 | 92 % |
| Dude where's my XV? by PetLov (on 6. February 2021, 21:06) | 32 | 92 % |
| 12 Arrows, 6 Rows by jovi_al (on 5. January 2022, 05:56) | 47 | 95 % |
| Zig by grkles (on 29. May 2022, 20:40) | 49 | 96 % |
| Canal View Sudoku by KNT (on 27. July 2022, 03:51) | 56 | 97 % |
| Arvada - a Beachcomber Sudoku by glum_hippo (on 3. November 2023, 04:20) | 54 | 96 % |
| Leaving the Basement (U-Bahn) by the_cogito (on 16. October 2024, 18:29) | 28 | 100 % |
| Six Pathway-Linked Puzzles by Genomico (on 22. September 2020, 15:36) | 35 | 97 % |
| NNN by mith (on 28. March 2022, 23:09) | 38 | 97 % |
| Thermosnakes by Nordy (on 21. April 2022, 08:00) | 37 | 93 % |
| Loopy Whisper 'Wich by yttrio (on 24. May 2024, 21:47) | 30 | 98 % |
| Cave / Nurikabe by Jesper (on 1. November 2020, 16:50) | 81 | 100 % |
| The Last Hurrah? by Playmaker6174 (on 2. August 2022, 07:17) | 45 | 99 % |
| A-Sums X Sandwich by ICHTUES (on 29. January 2023, 06:00) | 55 | 96 % |
