(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 | |
|---|---|---|---|
 | Very old burger (German Whisper + Kropki + Antiknight Sudoku) by Sktx (on 17. September 2022, 16:50) | 51 |  95 % |
| GP24 Leftover: Japanische Summen + Magnetplatten by ibag (on 24. March 2024, 20:24) | 35 | 99 % |
| X Gon' Give It To Ya by Justalilguy (on 7. February 2025, 17:11) | 40 | 96 % |
| Parity Runs #4: Odd Island by Madmahogany (on 12. June 2020, 23:30) | 33 | 93 % |
| Killers in the house by Joseph nehme (on 12. September 2020, 07:56) | 43 | 92 % |
| Highs and Lows by RobK (on 26. March 2021, 18:55) | 36 | 95 % |
| 38 (HBD Zetamath!) by Qodec (on 9. January 2022, 14:14) | 34 | 95 % |
| Chaos Circles (Updated) by SenatorGronk (on 10. October 2023, 19:54) | 115 | 97 % |
| Jungle Cruise by Sartor (on 17. March 2024, 19:19) | 44 | 90 % |
| Life on 36 cells by Phistomefel (on 13. January 2021, 00:42) | 102 | 95 % |
| Knights & Archers hold the Line by Florian Wortmann (on 30. January 2022, 14:54) | 96 | 96 % |
| Roller Coaster U-Bahn by Zzzyxas (on 22. August 2019, 18:25) | 54 | 99 % |
| Alien Cube by Nahileon (on 23. March 2022, 17:36) | 32 | 96 % |
| Numbered Sandwich Counts by RockyRoer (on 2. August 2022, 13:57) | 33 | 96 % |
| The Cs by ademjaz (on 23. September 2022, 00:54) | 32 | 92 % |
| Lightning Crashes by XeonRisq (on 23. February 2023, 04:00) | 34 | 92 % |
| Ikpork? by SSG (on 28. February 2023, 07:15) | 30 | 94 % |
| Careful with that hook, Emmett ! [S-Cell Sudoku] by Christounet (on 1. March 2023, 15:12) | 62 | 95 % |
| Mystery Boxes by Sumanta(ANU) (on 21. September 2023, 15:45) | 30 | 90 % |
| Corner Prison by Prof.Dori (on 7. November 2023, 10:23) | 200 | 95 % |
