(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 | |
|---|---|---|---|
 | Modular Snakes by Prof.Dori (on 27. October 2023, 09:20) | 45 |  100 % |
| Pathfinder by vitaminz (on 10. June 2024, 20:50) | 31 | 99 % |
| Devious Ability: Buy Free! by Elytron (on 22. August 2024, 20:57) | 19 | 94 % |
| Tinker by randall (on 21. September 2024, 09:18) | 29 | 91 % |
| The Folding Halls by SkepticalMario (on 7. October 2024, 05:00) | 18 | 95 % |
| Chessdoku-1: The London System by .proxz14 (on 20. February 2025, 14:43) | 15 | 92 % |
| Four By Four by IcyFruit (on 29. February 2024, 17:13) | 67 | 94 % |
| Japanese Sums #2: Balance by Myxo (on 26. April 2023, 21:10) | 48 | 98 % |
| Decapitated (Chaos Construction) by Black_Doom (on 14. January 2024, 18:48) | 126 | 96 % |
| Six-pack Linked Sudokus #10 - Sums by Genomico (on 30. September 2022, 16:30) | 33 | 100 % |
| Compass Chaos Construction by Jay Dyer (on 11. March 2023, 20:08) | 68 | 98 % |
| Liar X-Sums Chaos Construction by Christounet (on 23. January 2026, 08:33) | 69 | 100 % |
| Don't Know What We Dig 'em For by twototenth (on 9. November 2021, 08:00) | 51 | 100 % |
| Fractional Dimension (Chaos Construction) by Chilly (on 14. June 2022, 14:33) | 61 | 98 % |
| Downtown Fog by apiyo (on 21. June 2023, 13:52) | 66 | 90 % |
| 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) | 24 | 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 % |
