(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 | |
|---|---|---|---|
 | Wichtelkalender 2014 - Monat Oktober by r45 (on 1. October 2014, 00:00) | 51 |  99 % |
| Wichtel 2018 (1): Tapa mit U-Bahn und Hochhaushinweisen by wichtel (on 31. May 2019, 12:08) | 52 | 99 % |
| Murder on the Orient Express - killer sudoku by KevinCelis (on 18. July 2020, 00:07) | 14 | 95 % |
| Little Killer Sudoku #3 by Phistomefel (on 12. September 2020, 11:05) | 66 | 93 % |
| Surveyor Sudoku by stephane.bura (on 1. October 2020, 20:00) | 17 | 98 % |
| Pentominous + Killer Sudoku by mandourin (on 2. October 2020, 23:48) | 15 | 98 % |
| X-Distance Sudoku(2)——Hard by cdwg2000 (on 18. November 2020, 16:47) | 26 | 92 % |
| 真笑Puzzles031--69Sandwiches (5)--Nonconsecutive Double Sandwich by cdwg2000 (on 28. February 2021, 10:46) | 12 | 93 % |
| Quetzalcoatl by Tyrgannus (on 24. September 2021, 21:29) | 53 | 94 % |
| Smörgåsbord by Qodec (on 2. November 2021, 23:17) | 55 | 95 % |
| Marupeke Sudoku 5 by Crusader175 (on 8. January 2022, 19:45) | 14 | 95 % |
| Thermosnakes by Nordy (on 21. April 2022, 08:00) | 41 | 94 % |
| Riverbank - Episode 3: Watch on the Rhine by henrypijames (on 6. May 2022, 14:48) | 14 | 100 % |
| Übungsrätsel für die LM 2022: Bewegung bitte! by lupo (on 17. June 2022, 12:00) | 13 | 98 % |
| Paint by Numbers by ste221093 (on 19. August 2022, 19:59) | 13 | 91 % |
| Doublomania by lepton (on 3. January 2023, 21:14) | 28 | 98 % |
| Jelly Beans by cristophermoore (on 6. July 2023, 04:10) | 12 | 95 % |
| Little Killer Sandwiches by Jreg (on 6. September 2023, 07:00) | 69 | 93 % |
| Technodrome by Kafkapharnaum (on 4. March 2024, 03:51) | 14 | 95 % |
| ☯ Yin-Yang-Loop ☯ by ElChiglia (on 1. April 2024, 00:17) | 31 | 93 % |
