(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 | |
|---|---|---|---|
 | Yin Equals Yang by SSG (on 9. September 2022, 07:16) | 57 |  96 % |
| Pentomilin by Myxo (on 16. March 2025, 17:50) | 56 | 98 % |
| Equilibrium 2: The Rune by Mad-Tyas (on 13. December 2022, 09:42) | 35 | 94 % |
| The Swamp (Nurikabe Fillomino) by MaizeGator (on 16. July 2024, 16:37) | 42 | 96 % |
| Counting Sum Dots by Andrewsarchus (on 24. January 2026, 19:11) | 38 | 96 % |
| Balanced Chaos by fritzdis (on 29. November 2022, 16:24) | 127 | 97 % |
| Negators by mathpesto (on 20. August 2022, 00:41) | 57 | 96 % |
| A Third Loop by mathpesto (on 24. August 2023, 02:34) | 52 | 99 % |
| Purple Archery Arrows by antiknight (on 9. October 2022, 17:25) | 66 | 94 % |
| Nurikiller 2 by mathpesto (on 4. April 2023, 13:53) | 83 | 100 % |
| Ten Ring Circus by JeffWajes (on 30. December 2025, 06:27) | 145 | 98 % |
| Patches and Stitches by Sktx (on 15. November 2021, 13:00) | 31 | 97 % |
| The Corners are Even Double - Double Arrow Even/Odd Sudoku by Mr.Menace (on 29. August 2022, 20:08) | 30 | 93 % |
| The final test (Deconstruction/Killer/Anti-Knight/Connect the dots) by dumediat (on 30. December 2022, 03:17) | 26 | 99 % |
| Ancient Ruins (Fog, BYO Killer, Nurikabe) by lepton (on 6. February 2023, 16:24) | 72 | 95 % |
| Wichtels (später) Rätselsommer 2024 (11): Wichtel-Zwietracht by wichtel (on 11. October 2024, 20:23) | 15 | 100 % |
| Suguru Chaos Deconstruction #3: Whispering Palindromes by mathpesto (on 20. February 2022, 16:27) | 119 | 98 % |
| Pointed Chaos by yttrio (on 30. June 2023, 20:03) | 114 | 98 % |
| Chaos Construction: Position Sums (9x9) by Jesper (on 12. October 2021, 20:35) | 81 | 100 % |
| Vignettes by zetamath (on 18. July 2022, 00:54) | 85 | 99 % |
