(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 | |
|---|---|---|---|
 | Echo Chamber by etoler (on 24. February 2025, 16:25) | 57 |  96 % |
| yo tenía diez perritos by aqjhs (on 28. July 2025, 05:53) | 13 | 98 % |
| Robot Lines by marty_sears (on 18. November 2024, 12:41) | 132 | 96 % |
| Six-pack Linked Sudokus #10 - Sums by Genomico (on 30. September 2022, 16:30) | 32 | 100 % |
| Don't Know What We Dig 'em For by twototenth (on 9. November 2021, 08:00) | 50 | 100 % |
| Fractional Dimension (Chaos Construction) by Chilly (on 14. June 2022, 14:33) | 58 | 98 % |
| Downtown Fog by apiyo (on 21. June 2023, 13:52) | 66 | 90 % |
| Third Order Logic by Die Hard (on 26. October 2025, 22:57) | 60 | 98 % |
| X-Sums & Sandwiches by kolot (on 2. April 2022, 03:02) | 101 | 99 % |
| Meet The Twins - A Cryptic Anti-King (Little) Killer Sudoku by SirWoezel (on 25. June 2020, 17:13) | 21 | 96 % |
| Fortress of Archers by Mark Sweep (on 26. February 2021, 10:00) | 20 | 92 % |
| Club Med (A pure nonconsecutive arrow sudoku) by Farkov (on 9. March 2021, 12:21) | 23 | 94 % |
| Angel's Arrow by PotatoHead21 (on 4. July 2021, 03:52) | 24 | 97 % |
| Parity Killer by SudokuExplorer (on 7. July 2021, 03:36) | 41 | 94 % |
| Isolation by Nahileon (on 21. January 2022, 14:41) | 63 | 93 % |
| Swords by antiknight (on 5. April 2022, 20:45) | 46 | 94 % |
| Double fillomino by filuta (on 8. December 2022, 15:38) | 22 | 99 % |
| Double Date [Doublers, Killer, Renban, Arrow collab with Tallcat] by Malrog (on 15. April 2024, 14:47) | 45 | 96 % |
| Signpost Nanro (Aqre) by KNT (on 12. April 2025, 23:06) | 42 | 94 % |
| Chaos Construction: Battlefield by Jesper (on 16. December 2021, 13:25) | 66 | 100 % |
