(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 | |
|---|---|---|---|
 | Campobasso (XY-Difference-Paare) by glum_hippo (on 1. October 2024, 15:33) | 17 |  91 % |
| Cave / Nurikabe by Jesper (on 1. November 2020, 16:50) | 83 | 100 % |
| Broken Cello by Tyrgannus (on 9. October 2021, 21:02) | 48 | 93 % |
| Edelweiß by loerting (on 27. December 2023, 23:20) | 53 | 95 % |
| Zodiac (Cipher Japanese Sums Deconstruction) by tallcat (on 6. May 2024, 08:00) | 45 | 94 % |
| The church of not three by filuta (on 29. August 2024, 23:56) | 43 | 97 % |
| Relationship Status: It's Complicated by 99%Sneaky (on 17. January 2025, 16:25) | 47 | 93 % |
| Sudoku Variants Series (276) - Taxi Ride Sudoku by Richard (on 8. July 2020, 00:00) | 72 | 92 % |
| 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 % |
| Krypto - Tapa by Zzzyxas (on 2. May 2021, 16:29) | 48 | 100 % |
| 12 Arrows, 6 Rows by jovi_al (on 5. January 2022, 05:56) | 48 | 95 % |
| Multiple Signs by tesseralis (on 9. June 2022, 01:20) | 32 | 97 % |
| Where No Snake Has Gone Before by Nordy (on 13. July 2022, 20:43) | 47 | 99 % |
| Killer Inception by mnasti2 (on 27. October 2022, 23:00) | 26 | 96 % |
| A-Sums X Sandwich by ICHTUES (on 29. January 2023, 06:00) | 56 | 96 % |
| Quatre Coins: Four Corners 2 (Kropki Arrow X) by tallcat (on 11. July 2021, 14:51) | 67 | 95 % |
| 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 % |
