(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 | |
|---|---|---|---|
 | Between the Little Killers by Stavros96 (on 25. August 2020, 12:08) | 49 |  93 % |
| Black and White Cookie by pieguy (on 16. September 2023, 02:41) | 61 | 94 % |
| Sudoku Variants Series (177) - Frameless Sudoku by Richard (on 18. April 2017, 00:00) | 96 | 92 % |
| Double-Digit-Thermo III "The Ant nest" by Garford (on 10. February 2021, 17:55) | 34 | 99 % |
| Wheel of Killers by Prof.Dori (on 19. September 2024, 17:32) | 62 | 93 % |
| Table for Four - Battleship by uvo (on 19. August 2014, 12:27) | 41 | 97 % |
| Islands by SamuPiano (on 7. December 2021, 04:52) | 42 | 98 % |
| X-Sum Arrows by Phistomefel (on 29. December 2020, 09:35) | 58 | 99 % |
| Ben Nevis (Killer) by tallcat (on 30. December 2023, 13:50) | 96 | 97 % |
| Auf dem Oktoberfest by pirx (on 21. September 2013, 12:00) | 34 | 99 % |
| Die Kryptos - S01E06: ABC-Box by tuace (on 24. September 2017, 11:48) | 53 | 96 % |
| Wichtel 2019 (3): Die U-Bahn unter dem Geschenkelager by wichtel (on 9. July 2020, 20:01) | 45 | 100 % |
| Embedded Sandwich Sudoku - Taco Bowl by DiMono (on 8. March 2021, 06:41) | 39 | 98 % |
| "Doughts" for Bigger by PetLov (on 12. March 2021, 10:00) | 15 | 95 % |
| Thermal Killer (frei nach Madmahogany) by glum_hippo (on 6. May 2021, 05:30) | 42 | 92 % |
| Sagitta by Joseph nehme (on 29. May 2021, 06:13) | 40 | 94 % |
| Square Wheel by twototenth (on 6. July 2021, 07:00) | 29 | 94 % |
| Sándor Tótka (Tokyo 2020) by Lisztes (on 11. August 2021, 01:00) | 17 | 90 % |
| Familiar combo by PetLov (on 14. August 2021, 20:32) | 16 | 91 % |
| A Little Deconstruction by djorr (on 14. April 2022, 14:00) | 26 | 93 % |
