(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 | |
|---|---|---|---|
 | Modular Zipper by gdc (on 7. December 2023, 12:07) | 75 |  96 % |
| LM 2018 Countdown: Roller Coaster (3) by Uhu (on 31. May 2018, 10:06) | 64 | 96 % |
| Nightfall (German Whisper combo) by Playmaker6174 (on 22. October 2022, 22:29) | 70 | 96 % |
| Japanische Summen mit Rundweg by Uhu (on 14. September 2017, 15:52) | 52 | 98 % |
| Reban Arrow Sudoku by psninn (on 19. March 2024, 04:55) | 55 | 95 % |
| Chaotic counting by palpot (on 16. December 2023, 00:08) | 82 | 97 % |
| Gradius by Kafkapharnaum (on 20. May 2021, 15:23) | 44 | 94 % |
| PIRAT - Buchstabenrätsel / Letter puzzle by DocLogic (on 25. June 2021, 20:03) | 38 | 96 % |
| Loop Pentominous by Jay Dyer (on 7. March 2022, 21:43) | 39 | 96 % |
| Profusion (Yin Yang Killer) by troptot (on 14. February 2023, 19:07) | 38 | 94 % |
| Whispering Mask by josh_johnson (on 4. June 2023, 16:34) | 47 | 92 % |
| Stammtisch-Teamrätsel mit Portalen by CJK (on 12. August 2023, 19:08) | 38 | 100 % |
| Positive Ring by SudokuExplorer (on 19. January 2021, 02:00) | 66 | 96 % |
| Cryptic Triptych (Thermo Kropki Sudoku) by EliasKar (on 20. February 2021, 18:57) | 39 | 91 % |
| Way out of my way by PrimeWeasel (on 1. September 2022, 20:36) | 34 | 92 % |
| ADVENTSKALENDER - Buchstabenrätsel / Letter Puzzle by DocLogic (on 20. December 2022, 14:35) | 32 | 96 % |
| Quadruple Knights Out of Order by GBPack (on 23. July 2023, 17:20) | 117 | 94 % |
| Entropy Fish by Ridhwan (on 3. November 2023, 16:36) | 69 | 96 % |
| Chaos Construction: Glow by Xenonetix (on 7. February 2022, 01:00) | 61 | 95 % |
| Kropki Placement Sudoku #2 by udukos (on 24. November 2020, 10:27) | 26 | 92 % |
