(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 | |
|---|---|---|---|
 | Portal X-sums by Playmaker6174 (on 3. October 2023, 00:01) | 26 |  96 % |
| Lucky Break by Lulero (on 8. February 2024, 11:22) | 30 | 95 % |
| Archer's Gate by SudokuExplorer (on 20. July 2021, 02:00) | 61 | 97 % |
| Arrows And Dots by Jeet Sampat (on 14. March 2022, 03:18) | 53 | 98 % |
| Insight Out (Chaos Construction) by sfushidahardy (on 24. July 2024, 21:57) | 58 | 95 % |
| Islands 2: Global Ocean by SamuPiano (on 13. July 2023, 03:17) | 81 | 96 % |
| Fibonaccis Fillo-Tapa (Permakultur) by usp (on 4. August 2014, 12:00) | 28 | 93 % |
| Battlefield Sudoku #3: Uncharted by Big Tiger (on 15. June 2020, 02:07) | 26 | 94 % |
| Anti-Knight Killer Sudoku by Willy Wonka (on 26. July 2020, 04:56) | 86 | 95 % |
| Mean, Median, and Mode by RockyRoer (on 27. May 2021, 00:00) | 27 | 97 % |
| Xandwich by Qodec (on 4. January 2022, 01:14) | 50 | 96 % |
| Unbound by twototenth (on 23. August 2022, 08:00) | 28 | 93 % |
| Arrangement by wooferzfg (on 23. September 2022, 07:34) | 60 | 96 % |
| King Arthur by oxjphs (on 13. August 2023, 06:37) | 61 | 95 % |
| Kaboom by mathpesto (on 25. November 2023, 13:51) | 87 | 97 % |
| Cada oveja con su pareja by sujoyku (on 3. July 2024, 19:46) | 27 | 94 % |
| Ambiguity by zetamath (on 8. April 2021, 01:48) | 79 | 96 % |
| Wichtel 2018 (4): Ein spezielles Weihnachtsmarktgelände by wichtel (on 15. November 2019, 08:12) | 48 | 100 % |
| Cithara by BIGfoot (on 2. November 2021, 15:38) | 28 | 92 % |
| Knight's XV by Scruffamudda (on 25. April 2023, 22:38) | 26 | 95 % |
