(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 | |
|---|---|---|---|
 | Skyscraper Tessellation by ChinStrap (on 8. September 2025, 16:30) | 31 |  94 % |
| RAT RUN 19: Brainwaves by marty_sears (on 18. December 2024, 01:00) | 610 | 97 % |
| Wichtel 2013 (11 und Schluss): Schwere Entscheidung by wichtel (on 17. June 2014, 13:20) | 42 | 93 % |
| Chocolate Banana Sandwiches by Scojo (on 1. August 2023, 07:53) | 46 | 97 % |
| Chaos Circles (Updated) by SenatorGronk (on 10. October 2023, 19:54) | 118 | 98 % |
| 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 % |
| Bob the Killer by mellowrobinson (on 14. June 2025, 04:33) | 98 | 96 % |
| 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) | 67 | 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) | 15 | 95 % |
