(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 | |
|---|---|---|---|
 | Zodiac Project: Gemini by Christounet (on 19. September 2024, 13:18) | 130 |  98 % |
| Wichtel 2013 (11 und Schluss): Schwere Entscheidung by wichtel (on 17. June 2014, 13:20) | 43 | 93 % |
| Wichtel 2018 (5): Japanische U-Bahn by wichtel (on 29. November 2019, 02:18) | 42 | 99 % |
| Minesweeper Sudoku by Niverio (on 24. November 2021, 23:53) | 45 | 98 % |
| Neapolitan by pieguy (on 19. June 2023, 18:16) | 56 | 95 % |
| Chocolate Banana Sandwiches by Scojo (on 1. August 2023, 07:53) | 48 | 98 % |
| Spring Sudoku（1） by cdwg2000 (on 9. September 2020, 15:51) | 45 | 95 % |
| Archer Towers by Angelo (on 12. May 2022, 20:09) | 19 | 94 % |
| Cubic Doublers by Blobz (on 7. November 2022, 16:00) | 49 | 92 % |
| Strawberry Fields by cristophermoore (on 18. April 2023, 02:31) | 42 | 94 % |
| Stolen Whispers by Paquet Voleur (on 1. July 2023, 22:36) | 40 | 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 % |
| Wormholes (Chaos Construction) by kingoffries (on 28. May 2025, 18:27) | 136 | 97 % |
| Equilibrium by Rab3aron (on 21. February 2026, 20:43) | 23 | 91 % |
| Dustpan (Disjoint parity sweeper sudoku) by Qodec (on 23. February 2023, 13:00) | 126 | 97 % |
| Gebietsprodukte mit Null (III v. III) by Luigi (on 29. April 2010, 17:48) | 49 | 94 % |
| Wichtelkalender 2014 - Monat Oktober by r45 (on 1. October 2014, 00:00) | 52 | 99 % |
| Papers, Please [Anti-knight, German Whispers] by Justalilguy (on 5. August 2025, 22:23) | 64 | 91 % |
| Bob the Killer by mellowrobinson (on 14. June 2025, 04:33) | 102 | 96 % |
