(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 | |
|---|---|---|---|
 | Beauty Mark by zetamath (on 24. August 2023, 21:36) | 161 |  95 % |
| Wichtel 2013 (8): Professor Kropkis Zahlenkabinett by wichtel (on 9. April 2014, 12:30) | 76 | 98 % |
| Cageless (X) Killer Sudoku no. 3 by Shinya (on 3. April 2020, 22:10) | 23 | 96 % |
| Phantom Killer 9x9 by Mondestrunken (on 10. May 2020, 18:37) | 20 | 97 % |
| Hot Coffee [Thermo Killer Sudoku] by ogi.djukovic (on 20. February 2021, 08:00) | 23 | 91 % |
| 真笑Puzzles036--Chaos Construction-- “韩非子” 002 by cdwg2000 (on 27. March 2021, 09:27) | 20 | 93 % |
| Set Aside the Obvious by JoWovrin (on 26. June 2021, 16:33) | 20 | 94 % |
| Perfect Squares by ICHTUES (on 23. January 2022, 06:00) | 23 | 92 % |
| 真笑Puzzles041--Wall Sudoku by cdwg2000 (on 29. January 2022, 13:40) | 22 | 97 % |
| Beyond (Indexing Miracle) by Crusader175 (on 27. August 2023, 14:00) | 23 | 91 % |
| Slingshot Whisper Loop by yttrio (on 14. June 2025, 01:56) | 63 | 99 % |
| AntiknighthginkitnA by tribution (on 4. November 2022, 13:58) | 95 | 92 % |
| Crescent Archery by Xendari (on 14. November 2022, 08:57) | 43 | 93 % |
| Something Stupid by marty_sears (on 3. May 2026, 00:50) | 232 | 96 % |
| Hidden X-Sums by jwsinclair (on 4. July 2022, 20:13) | 58 | 98 % |
| Pyrotechnics by NicoD (on 29. April 2026, 05:30) | 59 | 95 % |
| The Fountain by Tobias Brixner (on 14. October 2023, 11:49) | 104 | 96 % |
| Encrypted Sandwich by cfop (on 31. January 2021, 21:18) | 19 | 95 % |
| Bleu Blanc Dot by PetLov (on 27. March 2021, 12:44) | 19 | 93 % |
| Carnivorous Pansy by PjotrV (on 10. April 2021, 09:22) | 20 | 95 % |
