(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 | |
|---|---|---|---|
 | Teleportation Cycle Sum Sudoku (2) by SudokuExplorer (on 13. April 2021, 01:00) | 27 |  97 % |
| The Grand Illusion by HalfBakedLunatic (on 14. May 2023, 15:03) | 34 | 95 % |
| RemotelyEntropic by Palfly Kampling (on 27. May 2023, 18:52) | 28 | 95 % |
| [TSL] damasosos92 would be sad if i didn't publish this by Myxo (on 26. October 2024, 14:30) | 27 | 95 % |
| Narrow Laneway Filled With Crooks by 99%Sneaky (on 30. August 2025, 00:53) | 30 | 95 % |
| Islands 2: Global Ocean by SamuPiano (on 13. July 2023, 03:17) | 86 | 96 % |
| Enter the Dragon! (Entropic Between Lines) by tallcat (on 14. November 2025, 07:00) | 59 | 94 % |
| Modular Region Sum Lines Sudoku by Phistomefel (on 7. March 2024, 20:52) | 148 | 98 % |
| Build Your Own Hitlines by marty_sears (on 16. December 2025, 13:59) | 229 | 97 % |
| Chaos Construction: X-Sums and Lines by KNT (on 2. April 2022, 19:42) | 94 | 96 % |
| Fibonaccis Fillo-Tapa (Permakultur) by usp (on 4. August 2014, 12:00) | 29 | 94 % |
| Wichtel 2018 (4): Ein spezielles Weihnachtsmarktgelände by wichtel (on 15. November 2019, 08:12) | 53 | 100 % |
| Battlefield Sudoku #3: Uncharted by Big Tiger (on 15. June 2020, 02:07) | 27 | 94 % |
| Timid Dominoes by Genomico (on 15. August 2020, 02:13) | 31 | 99 % |
| "Thermo" ;) by apiyo (on 11. February 2021, 05:51) | 35 | 91 % |
| Mean, Median, and Mode by RockyRoer (on 27. May 2021, 00:00) | 28 | 97 % |
| Very Friendly by PrimeWeasel (on 22. December 2022, 10:57) | 25 | 99 % |
| Unique Under the Fog 7.0 by Visumation (on 1. June 2025, 15:57) | 72 | 90 % |
| Hidden Inside by Rab3aron (on 16. April 2026, 12:10) | 27 | 93 % |
| Anti-Knight Killer Sudoku by Willy Wonka (on 26. July 2020, 04:56) | 91 | 95 % |
