(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 | |
|---|---|---|---|
 | Doublomania by lepton (on 3. January 2023, 21:14) | 26 |  98 % |
| Thursday by Listopad (on 9. February 2023, 08:16) | 19 | 90 % |
| Bloodsuckers by ViKingPrime (on 8. April 2023, 12:00) | 18 | 90 % |
| Odd Blockade Runners by JeffWajes (on 17. April 2023, 19:44) | 103 | 96 % |
| Misdirection by MicroStudy (on 24. May 2023, 15:31) | 41 | 95 % |
| Count to 10 by Playmaker6174 (on 29. July 2023, 12:45) | 43 | 93 % |
| Snails by Twan2797 (on 23. August 2023, 16:35) | 38 | 94 % |
| Gossip by Myxo (on 1. October 2023, 10:46) | 26 | 90 % |
| Coupled Up by IcyFruit (on 13. February 2024, 17:14) | 63 | 93 % |
| Seilkunde by Blashyrkh (on 16. May 2024, 17:40) | 35 | 95 % |
| The Clues, the Whole Clues, and Nothing but the Clues. by Abdul the Killer (on 23. July 2024, 12:34) | 52 | 96 % |
| Enigma Sequence by XeonRisq (on 31. August 2024, 20:00) | 16 | 95 % |
| Quadrilateral by jwsinclair (on 20. April 2024, 18:03) | 90 | 99 % |
| Blast Off (Region Sum Killer Diagonal) by tallcat (on 9. June 2023, 20:18) | 85 | 96 % |
| Killer Sudoku #2 — 'ZooZ' by PixelPlucker (on 31. October 2021, 13:55) | 39 | 92 % |
| Kuromasudoku by Phistomefel (on 26. November 2020, 20:18) | 73 | 98 % |
| Cave of Killers by Jay Dyer (on 22. April 2024, 23:41) | 111 | 97 % |
| RiesenRenbanKropki II by Richard (on 9. April 2010, 12:00) | 66 | 91 % |
| Wichtel 2014 (14 und Schluss): Durch den Zauberwald by wichtel (on 17. April 2015, 01:42) | 31 | 98 % |
| Vlad the Impaler - Parity mirror, killer sudoku by Mr.Menace (on 19. August 2023, 08:14) | 35 | 94 % |
