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
|
|---|
 | [PAC] Castle Wall (Knapp-Daneben)
by The Book Wyrm (on 14. September 2025, 23:41) | 23 | 
97 %
|
| Archer's Heart
by SudokuExplorer (on 5. October 2021, 00:00) | 48 |
98 %
|
| {Arrows,Collection}
by Prof.Dori (on 13. June 2023, 14:26) | 50 |
94 %
|
| ArrowThermoEntropy
by Mad-Tyas (on 30. July 2025, 15:39) | 53 |
91 %
|
| Wichtel 2020 (10): Vier Wichtel, vier Viertel
by wichtel (on 5. October 2021, 02:02) | 28 |
99 %
|
| Spiral Fillodoku (Spiral Galaxy, Fillomino, Killer sudoku hybrid)
by AnalyticalNinja (on 29. March 2023, 21:25) | 62 |
98 %
|
| a new world record
by aqjhs (on 8. April 2026, 02:51) | 33 |
92 %
|
| Quadstruction
by Oddlyeven (on 7. May 2023, 21:25) | 66 |
98 %
|
| Stitch the Broken Ring
by LuckyNumber8 (on 13. April 2021, 01:43) | 21 |
93 %
|
| Paradigm Shift (S-Cell Japanese Sums Cipher)
by Agent (on 7. March 2023, 09:00) | 38 |
98 %
|
| Cages Constriction (Slitherlink Chaos Construction Sudoku)
by rockratzero (on 8. April 2023, 10:43) | 42 |
95 %
|
| Meta-Icing
by Kafkapharnaum (on 11. July 2023, 01:24) | 18 |
100 %
|
| Rhizome (Fillomino/Landvermessung/Irrwisch)
by dumediat (on 13. September 2023, 13:06) | 17 |
97 %
|
| Inequalities
by Ennead (on 31. October 2023, 11:53) | 19 |
98 %
|
| Pêcher pour pêches (Killer Sudoku with Same Size Same Sum)
by purpl (on 27. April 2024, 23:58) | 20 |
92 %
|
| Tom and Jerry
by SXH (on 3. December 2024, 06:57) | 17 |
94 %
|
| Still no cage totals... - Odd/Even Killer Sudoku (#6)
by Mr.Menace (on 14. May 2021, 23:02) | 29 |
96 %
|
| Regional Yajilin ('Abandoned Factory')
by PixelPlucker (on 17. January 2022, 06:43) | 27 |
97 %
|
| [My 100th puzzle] The Secret of 100
by Mad-Tyas (on 5. October 2023, 13:48) | 28 |
97 %
|
| Chaos Construction: Nonogram
by Xendari (on 8. March 2024, 08:48) | 30 |
97 %
|
