(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 | |
|---|---|---|---|
 | Dutch Dominoes by Black_Doom (on 29. May 2024, 07:55) | 13 |  98 % |
| Varianten-Samurai-Sudoku by JonaS2010 (on 9. September 2018, 09:09) | 56 | 98 % |
| Chaos Construction: Battlefield by Jesper (on 16. December 2021, 13:25) | 52 | 99 % |
| Shikasudoku 2 by Qodec (on 12. February 2022, 12:09) | 51 | 94 % |
| Graffiti: A yajilomino experience (Fillomino/Yajilin) by dumediat (on 22. August 2023, 04:07) | 44 | 98 % |
| Foggy Banren by DarthParadox (on 9. August 2024, 23:18) | 76 | 94 % |
| Renber Whispan by Sktx (on 9. July 2023, 18:29) | 30 | 94 % |
| [My 100th puzzle] The Secret of 100 by Mad-Tyas (on 5. October 2023, 13:48) | 24 | 96 % |
| Stostone Cold (Chaos Construction) by Phistomefel (on 10. April 2024, 20:09) | 81 | 98 % |
| Horses are better in pairs by chameleon (on 12. April 2024, 11:47) | 24 | 93 % |
| Cosmic Cages by yanggang (on 24. July 2024, 23:20) | 25 | 91 % |
| Olympic Rings by Jobo (on 5. August 2024, 01:14) | 88 | 96 % |
| Border Square Diagonals by Phistomefel (on 21. May 2024, 19:16) | 93 | 97 % |
| Japanische Summen 2358 by Uhu (on 3. September 2017, 17:47) | 55 | 98 % |
| Twin Chaos Sudoku II by Richard (on 30. March 2012, 12:00) | 72 | 92 % |
| Doppler Effect by Knickolas (on 1. February 2024, 00:14) | 39 | 95 % |
| {Arrows,Collection} by Prof.Dori (on 13. June 2023, 14:26) | 43 | 97 % |
| Council Bluffs by glum_hippo (on 23. June 2023, 14:19) | 55 | 98 % |
| Fremde Notizen by berni (on 22. May 2011, 22:48) | 17 | 98 % |
| Doppelter Rundweg by rob (on 25. June 2014, 11:05) | 49 | 99 % |
