(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 | |
|---|---|---|---|
 | Astronomic Squares Sudoku by Philipp Huber (on 7. August 2020, 10:35) | 27 |  90 % |
| Taco Bowl 2 - More Meat by DiMono (on 14. March 2021, 19:30) | 30 | 98 % |
| Singularity Fever [Thermo] by Miky (on 14. June 2021, 20:47) | 30 | 96 % |
| Interlocked by Niverio (on 9. May 2022, 22:43) | 68 | 96 % |
| Diversity Killer by Migu (on 4. June 2023, 00:36) | 33 | 96 % |
| MILCHPRODUKT - Buchstabenrätsel / Letter Puzzle by DocLogic (on 6. October 2023, 13:56) | 30 | 97 % |
| Regional Differences by Laake (on 22. April 2024, 22:50) | 68 | 98 % |
| Zerteilter Rundweg (4) by BFaw (on 9. October 2012, 10:00) | 36 | 92 % |
| "21" Partial Killer by Djmelee3000 (on 17. September 2020, 22:31) | 40 | 95 % |
| 24 Rätsel in 24 Stunden (Teil 14) - Fillomino by Zzzyxas (on 24. June 2017, 13:24) | 78 | 93 % |
| Insight by Xenonetix (on 15. January 2022, 04:54) | 35 | 96 % |
| Mixed Doubles by marty_sears (on 28. August 2023, 18:38) | 43 | 98 % |
| Whirlpool by vitaminz (on 13. September 2024, 03:39) | 37 | 91 % |
| Killer Sudoku - Ignorant of 9's by ProwlingTiger (on 10. May 2020, 00:49) | 43 | 93 % |
| Dadly Sandwich by Cane_Puzzles (on 30. June 2022, 17:11) | 42 | 96 % |
| Stranded Friends by DarthParadox (on 14. July 2023, 00:12) | 39 | 94 % |
| Parity Sum Lines Sudoku by Agent (on 16. August 2022, 09:00) | 47 | 97 % |
| Product Ltd. by BoaConstructor (on 30. July 2020, 12:57) | 51 | 97 % |
| Fully Booked [Numbered Rooms Fillomino] by MicroStudy (on 26. January 2024, 12:26) | 97 | 97 % |
| Left Out by fritzdis (on 26. February 2021, 04:57) | 51 | 97 % |
