(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 | |
|---|---|---|---|
 | XX Sandwich by Tomatenalat (on 15. September 2024, 11:46) | 92 |  96 % |
| LM 2016 - Leftover: Mauerrundweg by CHalb (on 1. July 2016, 20:16) | 35 | 93 % |
| Think Outside the Cage by cristophermoore (on 22. September 2021, 03:35) | 39 | 98 % |
| Pandora's BoXXX by twototenth (on 13. December 2022, 08:00) | 40 | 93 % |
| ECKIG - RUND - OVAL - Buchstabenrätsel by DocLogic (on 23. May 2020, 00:31) | 32 | 94 % |
| Diagonal Killer Sudoku by Selsted (on 2. August 2020, 15:10) | 39 | 92 % |
| MiniClues by Mesmer (on 13. August 2020, 01:36) | 35 | 94 % |
| Catch The Zippersnake by marty_sears (on 8. January 2024, 01:41) | 107 | 97 % |
| Quad van de Wetering by PotatoHead21 (on 31. March 2024, 23:38) | 99 | 98 % |
| Huey, Dewey, Louie by Crusader175 (on 3. September 2022, 15:00) | 71 | 97 % |
| Überlappungssudoku by Richard (on 25. December 2009, 12:00) | 86 | 94 % |
| [159] Tilted by W1DEMAN (on 27. September 2023, 06:45) | 30 | 92 % |
| X-Sum Sandwich Products by RockyRoer (on 19. November 2023, 05:32) | 27 | 97 % |
| Slingshot Skirmish 4 - Mirror Match by Allagem (on 30. April 2024, 13:34) | 31 | 91 % |
| Augur's gift (Japanese sums/Mean mini/Kropki) by dumediat (on 24. May 2024, 03:09) | 28 | 97 % |
| Incongruity by zetamath (on 20. August 2024, 20:36) | 30 | 98 % |
| 3etweeN by Qodec (on 17. April 2021, 17:56) | 78 | 98 % |
| Reciprocity by ICHTUES (on 26. June 2022, 06:00) | 130 | 97 % |
| 3D JapaSumino + 3 by Luigi (on 6. December 2011, 20:25) | 45 | 98 % |
| Killer/Little Killer Sudoku - Find x! - Part 2 by ProwlingTiger (on 16. May 2020, 20:50) | 49 | 95 % |
