(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 | |
|---|---|---|---|
 | Kurodoku by yttrio (on 27. July 2024, 02:27) | 56 |  99 % |
| e m p t y = c h a o s by aqjhs (on 28. December 2024, 06:15) | 55 | 97 % |
| Schlangen im Fillomino-Nest III by tuace (on 3. March 2017, 11:24) | 28 | 99 % |
| Roller Coaster mit Extras 2 by Uhu (on 5. January 2018, 21:48) | 65 | 99 % |
| Mathrax Fillomino by Gliperal (on 28. November 2022, 01:44) | 40 | 96 % |
| Double Filtration by Jay Dyer (on 2. February 2023, 19:28) | 57 | 97 % |
| Dritter Pfeilchenstrauß by glum_hippo (on 10. September 2020, 22:00) | 23 | 96 % |
| Word Search Sudoku by Stavros96 (on 30. November 2020, 10:06) | 18 | 98 % |
| Why Can't We Be Friends? by SlowLarry (on 21. December 2020, 22:06) | 27 | 98 % |
| Pointing Pairs Fillomino by Mark Sweep (on 16. April 2021, 10:00) | 26 | 98 % |
| Double the Math - Mystery by Mad-Tyas (on 25. May 2021, 07:49) | 18 | 92 % |
| An Homage To Simon by Ronnyson (on 30. August 2021, 11:58) | 19 | 94 % |
| Juosan Parity Parade by kolot (on 9. November 2021, 13:31) | 14 | 98 % |
| Full Rank Sudoku by Gliperal (on 3. April 2023, 07:18) | 97 | 97 % |
| Sandwich Boxes by Ennead (on 8. June 2023, 20:31) | 33 | 92 % |
| World's Tallest Sandwich by Jreg (on 21. August 2024, 13:01) | 18 | 92 % |
| Haywire by mathpesto (on 5. September 2024, 22:21) | 41 | 97 % |
| Something something lines by filuta (on 7. September 2024, 08:56) | 15 | 93 % |
| The Taste of Entropy by Mad-Tyas (on 10. September 2024, 05:35) | 37 | 93 % |
| Japanische Inseln, Teil 2 by pirx (on 25. February 2014, 18:30) | 56 | 98 % |
