(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 | |
|---|---|---|---|
 | 4D Killer Sudoku by FryTheGuy (on 11. October 2021, 22:29) | 28 |  100 % |
| Gin (11x11 Deconstruction) by lerroyy (on 13. November 2022, 23:51) | 27 | 99 % |
| J-Sum Country Chaos by Cephalo (on 23. June 2023, 10:00) | 27 | 98 % |
| Palindromic Little Killer X Sudoku by SudokuExplorer (on 23. February 2021, 01:00) | 50 | 96 % |
| Multi-sudoku: Orb 2 by DiMono (on 23. April 2021, 07:58) | 30 | 97 % |
| Fission (Classic Thermo) by emmettcito (on 7. May 2021, 12:37) | 30 | 96 % |
| Odd one out by jenssteenmetz (on 26. June 2021, 23:06) | 15 | 100 % |
| Even Small Prime by FryTheGuy (on 13. December 2021, 16:28) | 29 | 99 % |
| Archery Target by Nahileon (on 24. April 2022, 15:48) | 43 | 97 % |
| Invisible Killers by yttrio (on 10. March 2023, 21:32) | 43 | 95 % |
| Manifold Paths (Advanced Black Hole) by heliopolix (on 16. June 2023, 02:14) | 15 | 100 % |
| Manhattan by wooferzfg (on 17. August 2023, 02:49) | 27 | 98 % |
| Cryptic Shaders by wooferzfg (on 27. January 2024, 09:27) | 12 | 100 % |
| Blue Prince by vfig (on 21. June 2025, 06:34) | 15 | 92 % |
| Welcome to Chaconopia (Chaos Construction) by Mad-Tyas (on 16. August 2025, 13:24) | 16 | 96 % |
| Das Prinzip der Polarität by tuace (on 3. September 2017, 17:16) | 25 | 96 % |
| Miracle Clones [Tribute to Botaku] by Undar_Beyond (on 10. November 2020, 20:34) | 32 | 91 % |
| Toil and Trouble by Scojo (on 30. May 2025, 22:45) | 27 | 94 % |
| Fillomenon by DarthParadox (on 2. October 2023, 19:14) | 131 | 97 % |
| Wichtel 2017 (8): Ein rätselhaftes Experiment by wichtel (on 17. August 2018, 03:05) | 37 | 100 % |
