(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 | |
|---|---|---|---|
 | Shrug by dennischen (on 20. July 2024, 08:48) | 36 |  98 % |
| Huitzilopochtli by aqjhs (on 25. December 2024, 13:07) | 61 | 95 % |
| HERBST - Buchstabenrätsel / Letter Puzzle by DocLogic (on 28. October 2024, 10:10) | 25 | 97 % |
| ABENNR by FullDeck-Missing (on 14. November 2024, 06:20) | 63 | 95 % |
| Stealth (feat. tallcat) by the_cogito (on 11. November 2022, 04:10) | 80 | 94 % |
| A Hero Emerges by Joseph nehme (on 29. August 2024, 08:04) | 91 | 91 % |
| Milchstraße (Sektor 23F) by usp (on 5. November 2014, 00:00) | 48 | 98 % |
| Thermo Yin Yang by oklux (on 10. October 2022, 19:44) | 41 | 96 % |
| Hungarian Tapa / Roller Coaster (1) by KNT (on 23. September 2022, 20:45) | 59 | 99 % |
| seven swans a-swimmin' by aqjhs (on 18. December 2024, 03:45) | 106 | 97 % |
| Crosswalk by zetamath (on 3. March 2024, 19:32) | 116 | 96 % |
| Killer Pyramide by tuace (on 3. October 2013, 02:30) | 67 | 94 % |
| Skyscrapers 9*9 by cdwg2000 (on 12. September 2020, 18:37) | 46 | 97 % |
| Sandwich Sudoku--Odd or Even(CSC2020 Leftover) by cdwg2000 (on 21. October 2020, 16:06) | 17 | 96 % |
| Handshake by Asimir (on 13. May 2021, 03:10) | 18 | 94 % |
| Compass Cave by MagnusJosefsson (on 14. January 2022, 08:26) | 29 | 100 % |
| A riddle, wrapped in an entropic line, inside a sudoku by Raumplaner (on 24. April 2022, 15:17) | 14 | 93 % |
| Assassin9 (Irregular Killer Arrow Sudoku) by Ore (on 5. May 2022, 00:00) | 16 | 96 % |
| HyperBan by mormagli (on 20. June 2022, 23:33) | 15 | 96 % |
| Entropic Arena by Raumplaner (on 16. October 2022, 12:07) | 35 | 92 % |
