(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 | |
|---|---|---|---|
 | Anti-Sudoku by HawkAvatar (on 21. June 2021, 14:02) | 14 |  98 % |
| (anti) R5nban Arrow Windoku by Jeroen Panda (on 29. July 2021, 09:44) | 16 | 98 % |
| Two's Company by apiyo (on 11. September 2021, 05:52) | 17 | 94 % |
| Kyūdō by thoughtbyte (on 23. September 2021, 04:49) | 17 | 90 % |
| Beyond the Veil by XeonRisq (on 7. November 2021, 02:00) | 17 | 92 % |
| Liar Kropki by Dandelo (on 1. April 2022, 00:14) | 16 | 90 % |
| Forked by Emphyrio (on 11. April 2022, 17:57) | 18 | 92 % |
| Huey, Dewey, Louie by Crusader175 (on 3. September 2022, 15:00) | 75 | 97 % |
| Surroundings by PetLov (on 28. September 2022, 21:25) | 16 | 90 % |
| Modesty (Equalines Sudoku) by Mad-Tyas (on 21. February 2023, 09:16) | 56 | 98 % |
| X-Sum Sandwich Products by RockyRoer (on 19. November 2023, 05:32) | 31 | 95 % |
| A Deal With the Devil by ViKingPrime (on 14. December 2023, 16:30) | 29 | 98 % |
| BRIEFUMSCHLAG - Buchstabenrätsel / Letter Puzzle by DocLogic (on 17. December 2023, 14:21) | 29 | 96 % |
| A Christmas Vacation Around the World (CTC Secret Santa 2023) by Niverio (on 27. December 2023, 15:11) | 34 | 91 % |
| Vertices by arbitrary (on 12. February 2024, 19:55) | 20 | 96 % |
| CountDoku by AFrayedKnot (on 21. June 2024, 02:09) | 30 | 92 % |
| What is the sum? by Benji1810 (on 23. February 2025, 19:13) | 34 | 92 % |
| A Bit of 12-Line Fun by ebiggie (on 20. July 2025, 13:42) | 36 | 95 % |
| Dutch Angles by ndsurgenor (on 30. March 2025, 12:04) | 16 | 90 % |
| Every Pea, Every Screw (with sujoyku) by SamuPiano (on 30. May 2025, 15:44) | 47 | 97 % |
