(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 | |
|---|---|---|---|
 | Strawberry Fields by cristophermoore (on 18. April 2023, 02:31) | 42 |  94 % |
| Stolen Whispers by Paquet Voleur (on 1. July 2023, 22:36) | 39 | 91 % |
| Joint Efforts by sujoyku (on 13. October 2023, 15:08) | 24 | 91 % |
| Hardened Points by arbitrary (on 20. December 2023, 23:31) | 20 | 94 % |
| Elevator Action (First Hidden Skyscraper Sudoku) by glum_hippo (on 19. July 2024, 16:16) | 19 | 93 % |
| Holy Water by wuc (on 26. March 2025, 17:29) | 55 | 93 % |
| Hammerhead by cygne (on 7. January 2026, 17:29) | 49 | 96 % |
| Battle of Evermore by kuraban (on 17. February 2024, 03:03) | 156 | 96 % |
| Gebietsprodukte mit Null (III v. III) by Luigi (on 29. April 2010, 17:48) | 49 | 94 % |
| Papers, Please [Anti-knight, German Whispers] by Justalilguy (on 5. August 2025, 22:23) | 63 | 91 % |
| Palindromic Snake by Phistomefel (on 18. March 2020, 00:38) | 76 | 94 % |
| Anti-Springer Killer, "Postkarte vom Mars" by glum_hippo (on 3. November 2021, 02:16) | 39 | 90 % |
| Bubbles by alexc (on 20. March 2024, 03:30) | 37 | 93 % |
| Nurikabe Kurotto by Paletron (on 12. June 2024, 10:57) | 34 | 94 % |
| Recoil: No Longer an Introduction by damasosos92 (on 17. March 2025, 18:09) | 31 | 95 % |
| The Great River by Blobz (on 23. December 2024, 16:00) | 191 | 95 % |
| Wichtel 2013 (11 und Schluss): Schwere Entscheidung by wichtel (on 17. June 2014, 13:20) | 42 | 93 % |
| Februar Prim-Monat (3) - Prim Killer (B) by Richard (on 10. February 2012, 12:00) | 63 | 91 % |
| Killer Around the Corner by SudokuExplorer (on 20. April 2021, 01:00) | 66 | 96 % |
| Sandwiches for Table Four by RockyRoer (on 22. March 2023, 10:25) | 62 | 96 % |
