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
|
|---|
 | Stitch the Broken Ring
by LuckyNumber8 (on 13. April 2021, 01:43) | 21 | 
93 %
|
| Meta-Icing
by Kafkapharnaum (on 11. July 2023, 01:24) | 17 |
100 %
|
| Galactic Aquariums (Spiral Galaxy Aquarium hybrid)
by AnalyticalNinja (on 17. August 2023, 01:04) | 19 |
97 %
|
| 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 %
|
| Tentropic Terrier
by Scojo (on 11. June 2025, 20:06) | 20 |
97 %
|
| [TSL][S1T6] Across the Stars
by The Book Wyrm (on 30. July 2025, 17:07) | 22 |
98 %
|
| 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) | 29 |
97 %
|
| Thermal Signatures
by Kafkapharnaum (on 12. May 2025, 01:13) | 60 |
98 %
|
| Anti-Knight Killer Sudoku - Balanced cages
by ahaupt (on 31. May 2020, 22:31) | 44 |
90 %
|
| Paradigm Shift (S-Cell Japanese Sums Cipher)
by Agent (on 7. March 2023, 09:00) | 34 |
98 %
|
| Colorguru Chaos Deconstruction: Palindromes
by crispy16 (on 17. June 2022, 19:42) | 45 |
99 %
|
| Firework for Entropy No. 50
by Mad-Tyas (on 19. December 2023, 18:19) | 48 |
95 %
|
| Yin-yang Anti-Knight
by Tom1i (on 30. April 2020, 21:59) | 16 |
96 %
|
| Parity sections Sudoku
by stephane.bura (on 25. May 2020, 08:35) | 17 |
93 %
|
