(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-Knight Killer Sudoku #2 by udukos (on 2. March 2021, 10:19) | 67 |  95 % |
| Sudoku Variants Series (245) - Counting Neighbours Sudoku by Richard (on 4. December 2018, 00:00) | 109 | 93 % |
| Sudokulike [DFoW] by Nurator (on 6. March 2025, 11:58) | 157 | 96 % |
| Pocket Sandwich Sudoku by Genomico (on 1. November 2020, 20:25) | 16 | 92 % |
| Boba by grkles (on 20. April 2021, 18:28) | 30 | 94 % |
| Jigsaw by PotatoHead21 (on 20. June 2021, 19:54) | 22 | 90 % |
| 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 % |
| Vertices by arbitrary (on 12. February 2024, 19:55) | 19 | 96 % |
