(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 | |
|---|---|---|---|
 | Target Acquired (Equalines Sudoku) by Sktx (on 4. February 2023, 22:17) | 22 |  95 % |
| The Chained Trio (Between x Lockout x Double Arrow) by Playmaker6174 (on 19. March 2023, 18:23) | 23 | 96 % |
| RedivideR by goodcity (on 17. March 2024, 16:36) | 17 | 92 % |
| Fillomino Sudoku by spxtr (on 29. August 2020, 08:26) | 29 | 95 % |
| The 2-Colour Theorem by starwarigami (on 17. February 2023, 08:46) | 61 | 94 % |
| 2T1L by ICHTUES (on 11. September 2022, 06:00) | 66 | 95 % |
| Zwei Bärenfreunde by berni (on 11. August 2010, 14:16) | 21 | 92 % |
| Divisibility Squares Sudoku by ProwlingTiger (on 16. July 2020, 03:33) | 21 | 97 % |
| Anti-Knight Little Killer Sudoku by udukos (on 28. August 2020, 05:29) | 46 | 96 % |
| Norinori Killer Sudoku by SudokuExplorer (on 9. February 2021, 01:00) | 75 | 96 % |
| Tilted Mirror - Palindrome Killer Sudoku by Tyrgannus (on 27. March 2021, 05:26) | 21 | 97 % |
| Interception (Arrow Sudoku) by tallcat (on 1. September 2021, 14:30) | 34 | 95 % |
| Stepping Stones by RockyRoer (on 2. October 2021, 15:00) | 19 | 97 % |
| 1590 by twototenth (on 8. February 2022, 08:00) | 31 | 96 % |
| ripple by mormagli (on 29. November 2022, 22:26) | 74 | 97 % |
| Skyscraper Slingshot Sudoku by Piatato (on 2. February 2023, 21:43) | 31 | 100 % |
| Parasite by XeonRisq (on 10. March 2023, 17:00) | 24 | 93 % |
| Eiger (Killer sudoku) by Qodec (on 3. December 2023, 15:41) | 135 | 97 % |
| Team Sum Sudoku by Phistomefel (on 7. May 2024, 19:32) | 73 | 96 % |
| Roller Coaster mit Extras 5 by Uhu (on 11. March 2018, 13:50) | 54 | 99 % |
