(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 | |
|---|---|---|---|
 | Turbulence (Coordinate Arrows) by Sotehr (on 3. July 2025, 14:00) | 29 |  94 % |
| Yin Yang Sandwiches by flutchman (on 4. October 2025, 22:23) | 45 | 93 % |
| Serial Killers by starwarigami (on 10. April 2023, 06:44) | 97 | 96 % |
| Neighbors Sudoku by Gliperal (on 26. June 2022, 14:51) | 81 | 97 % |
| Different, But Still Wrogn by DiMono (on 3. June 2022, 23:39) | 82 | 97 % |
| Japanese Aquarium by Jay Dyer (on 3. January 2023, 23:06) | 72 | 99 % |
| Ginnels & Snickets (Between Skyscraper) by tallcat (on 29. September 2022, 19:22) | 57 | 98 % |
| Temperature (Thermo, Entropy) by Mad-Tyas (on 30. January 2023, 08:22) | 59 | 93 % |
| Eiger (Killer sudoku) by Qodec (on 3. December 2023, 15:41) | 157 | 96 % |
| Shady Fillomino by Agent (on 18. June 2024, 09:00) | 51 | 97 % |
| Sum Compass Sudoku by stephane.bura (on 31. December 2020, 20:00) | 35 | 100 % |
| 1590 by twototenth (on 8. February 2022, 08:00) | 33 | 96 % |
| Halves and Halve Nots (Dynamic Fog Edition) by ViKingPrime (on 28. September 2025, 22:45) | 44 | 92 % |
| Diamond Rank by Andrewsarchus (on 20. January 2026, 07:39) | 34 | 95 % |
| Anti-Knight X arrow by psninn (on 29. October 2024, 09:19) | 76 | 91 % |
| Marco Polo (Loop Deconstruction) by Agent (on 6. June 2023, 09:00) | 107 | 98 % |
| Summenbild mit Lücken by Calavera (on 1. September 2009, 02:51) | 69 | 96 % |
| Cageless (X) Killer Sudoku no. 2 by Shinya (on 23. March 2020, 12:58) | 24 | 95 % |
| Anti-Knight Little Killer Sudoku by udukos (on 28. August 2020, 05:29) | 52 | 96 % |
| Multi-grid Multi-variant Sudoku - Simon Is Dead! by DiMono (on 14. November 2020, 09:00) | 27 | 98 % |
