(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 | |
|---|---|---|---|
 | The Lobster by Sneppix (on 2. April 2026, 01:50) | 39 |  92 % |
| Middle Ground by etoler (on 4. June 2026, 16:25) | 18 | 100 % |
| Shadowku by marty_sears (on 12. September 2024, 01:56) | 202 | 97 % |
| Pentonimo Kakuro by julius64 (on 4. May 2013, 14:24) | 54 | 95 % |
| Doppelter Rundweg by SilBer (on 4. July 2009, 11:21) | 84 | 95 % |
| Sort Circuit by IcyFruit (on 13. November 2023, 22:49) | 50 | 93 % |
| Quietly Walking the Paths by EPH (on 21. September 2022, 02:22) | 49 | 95 % |
| Hashi Sudoku by RockyRoer (on 4. July 2020, 17:40) | 15 | 98 % |
| Reversion to the Mean (Regression zur Mitte) by cristophermoore (on 20. March 2021, 23:24) | 16 | 93 % |
| Primescraper: Skysweeper by grkles (on 12. April 2021, 20:49) | 27 | 94 % |
| (Sudoku) Consecutive Decomposition by stimim (on 24. April 2021, 17:38) | 16 | 95 % |
| Crystal by Qodec (on 22. June 2021, 22:53) | 67 | 91 % |
| Regiscissors by Tyrgannus (on 16. July 2021, 00:51) | 51 | 96 % |
| Suburbs by grkles (on 29. July 2021, 03:00) | 24 | 94 % |
| Flikk Flakk by PetLov (on 12. December 2021, 14:29) | 15 | 91 % |
| It's all math! by tenaliraman (on 20. January 2022, 19:04) | 12 | 95 % |
| Dropped Kropkis by Dag H (on 27. May 2022, 10:49) | 15 | 90 % |
| Code 9-12 (Sudoku31) by Sumanta(ANU) (on 18. July 2022, 15:39) | 31 | 92 % |
| Pianosa by jwsinclair (on 13. September 2022, 18:50) | 14 | 93 % |
| Jellyfish by Nordy (on 11. February 2023, 08:00) | 16 | 91 % |
