(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 | |
|---|---|---|---|
 | Zodiac Project: Ponta Delgada by Florian Wortmann (on 9. July 2024, 19:49) | 89 |  97 % |
| Circles and Sets by JeffWajes (on 22. January 2024, 02:21) | 105 | 97 % |
| Mislabeled Killers by CaptZebraCakes (on 27. June 2024, 04:35) | 131 | 98 % |
| RAT RUN 13: Triskaidekaphilia by marty_sears (on 6. November 2024, 02:13) | 458 | 97 % |
| MasyU-Bahn (Teil 2) by Zzzyxas (on 2. April 2015, 20:35) | 62 | 99 % |
| Different Neighbours U-Bahn by Paletron (on 2. June 2024, 11:30) | 35 | 96 % |
| Cracked Chaos by Astr0creep (on 13. August 2024, 19:39) | 36 | 96 % |
| Degraded Cells (Juggler Impression) by gdc (on 9. September 2024, 18:15) | 35 | 96 % |
| Twin Killer IV (B) by Richard (on 6. August 2010, 12:00) | 75 | 94 % |
| Sudoku Variants Series (406) - Cold Arrows by Richard (on 10. January 2025, 12:00) | 78 | 94 % |
| Rätselwochenende: Table for Four - Easy as Pentomino by uvo (on 26. November 2014, 16:40) | 38 | 93 % |
| Dallas by ICHTUES (on 10. October 2021, 06:00) | 82 | 96 % |
| Until Ten (10-lines, parity mirror) by the_cogito (on 20. February 2023, 15:28) | 40 | 97 % |
| Shield Birds by 99%Sneaky (on 16. September 2024, 23:44) | 95 | 94 % |
| Die Traumaufzeichnung by berni (on 28. May 2009, 14:38) | 44 | 91 % |
| Sums and Products Killer Sudoku by PixelPlucker (on 29. November 2020, 04:46) | 46 | 98 % |
| Tesla Coil (German Whispers + Odd/Even) by purpl (on 3. November 2021, 19:27) | 51 | 93 % |
| Focus by FlowJo (on 21. March 2022, 22:37) | 52 | 97 % |
| Archery Contest: XV by I Love Sleeping (on 17. November 2024, 03:21) | 49 | 97 % |
| Killer X Sudoku by ICHTUES (on 9. May 2021, 06:00) | 54 | 96 % |
