(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 | |
|---|---|---|---|
 | Christmas Cat Run by phil_the (on 2. January 2025, 14:25) | 26 |  93 % |
| Antenna by Gene The Supreme (on 27. January 2025, 18:37) | 19 | 91 % |
| The Roc's Shadow (Zippular Lines #3) by heliopolix (on 27. December 2023, 16:22) | 38 | 92 % |
| Merry Christmas Zetamath! by Scojo (on 27. March 2023, 01:29) | 33 | 91 % |
| LM 2024 Leftover: Extra Region U-Bahn by uvo (on 21. June 2024, 12:00) | 31 | 96 % |
| Es war einmal eine geheime Schrift by berni (on 1. November 2008, 15:56) | 77 | 92 % |
| The Stinger by Mark Sweep (on 21. October 2020, 12:31) | 47 | 93 % |
| Four Sevens by ThePedallingPianist (on 8. December 2022, 19:53) | 28 | 91 % |
| Gravitation by Niverio (on 3. July 2024, 19:49) | 24 | 92 % |
| Pentopia Rundweg by tuace (on 22. April 2019, 09:55) | 63 | 98 % |
| Anticamel Coloring Book by gdc (on 30. December 2024, 21:26) | 101 | 96 % |
| Homebound Sandwich Sudoku by Sebastian Losch (on 25. April 2020, 21:37) | 18 | 94 % |
| Gossiping Queens on 7x7 Torus by SudokuExplorer (on 10. September 2020, 17:44) | 17 | 93 % |
| Sandwich Sudoku--春卷 by cdwg2000 (on 30. October 2020, 13:56) | 18 | 91 % |
| Mystery Sandwiches or X-Sums by UnnamedSorcerer (on 18. November 2020, 01:59) | 15 | 96 % |
| Triplet Sums by Realshaggy (on 27. January 2021, 23:59) | 30 | 93 % |
| Distant Relations #2 by Big Tiger (on 13. March 2021, 06:27) | 14 | 93 % |
| Synthesis (Killer/Renban/Antiknight) by dumediat (on 29. June 2023, 00:35) | 74 | 93 % |
| Gerade-Ungerade-Killer III by Realshaggy (on 17. September 2013, 11:31) | 83 | 95 % |
| Ring around the rosie by siron2133 (on 20. November 2022, 11:57) | 61 | 97 % |
