(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 | |
|---|---|---|---|
 | ripple by mormagli (on 29. November 2022, 22:26) | 82 |  97 % |
| Ginnels & Snickets (Between Skyscraper) by tallcat (on 29. September 2022, 19:22) | 56 | 98 % |
| Splatter by PotatoHead21 (on 23. July 2021, 03:35) | 45 | 91 % |
| Whisper Whisper by Jay Dyer (on 20. August 2022, 13:08) | 43 | 99 % |
| Made to be Broken by jwsinclair (on 23. January 2023, 20:54) | 42 | 97 % |
| Ta(x)i-Cab Sums: by RockyRoer (on 6. December 2020, 13:35) | 27 | 92 % |
| Sum Compass Sudoku by stephane.bura (on 31. December 2020, 20:00) | 29 | 100 % |
| Schrödinger's Arrows by starwarigami (on 14. January 2022, 04:34) | 29 | 96 % |
| Chaotic Archery - Chaos Construction Sudoku by Mr.Menace (on 12. May 2022, 22:51) | 73 | 97 % |
| Perfectly Average Killers by Tacosian (on 14. March 2023, 03:13) | 44 | 94 % |
| Cuitláhuac by aqjhs (on 20. April 2025, 04:20) | 42 | 97 % |
| 真笑Puzzles007:Bachelor(光棍) Sudoku02 by cdwg2000 (on 23. December 2020, 22:43) | 15 | 92 % |
| Position Sums mit Renban-Streifen by glum_hippo (on 29. June 2021, 07:23) | 30 | 99 % |
| Palindrome Builder by Quarterthru (on 10. July 2021, 17:00) | 16 | 94 % |
| Stepping Stones by RockyRoer (on 2. October 2021, 15:00) | 30 | 98 % |
| 100 by EricRathbun (on 25. September 2022, 22:50) | 18 | 92 % |
| Réaltraí (Pentominous spiral galaxies/Fillomino) by dumediat (on 27. January 2024, 20:19) | 51 | 100 % |
| Total Chaos by Bert (on 5. June 2024, 18:32) | 30 | 98 % |
| Navigation by ThePedallingPianist (on 7. December 2024, 18:48) | 15 | 92 % |
| E : y² + xy = x³ + 12948x + 421776 by aqjhs (on 20. February 2025, 11:36) | 15 | 92 % |
