(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 | |
|---|---|---|---|
 | Double Duty | Zweifache Zahlenbedeutung by olima (on 21. February 2023, 22:52) | 46 |  98 % |
| Uraninite (Killer cages, Odd/Even) by Bellsita (on 24. July 2024, 20:22) | 89 | 92 % |
| Wichtel 2015 (9): Das Amulett by wichtel (on 6. June 2016, 15:20) | 34 | 97 % |
| My cup of tea - arrow/killer sudoku by Mr.Menace (on 23. April 2021, 22:07) | 37 | 97 % |
| Tapa-Berührungsrundweg by usp (on 16. July 2014, 00:00) | 64 | 98 % |
| Normal Lunchbox by Undar_Beyond (on 14. May 2020, 11:26) | 65 | 95 % |
| Heat Stroke by juggler (on 17. January 2024, 01:32) | 69 | 95 % |
| ♫ Slitherlink take me home ♫ by Phistomefel (on 1. April 2022, 01:04) | 55 | 99 % |
| Sum Set Sudoku by Genomico (on 11. May 2021, 00:00) | 26 | 99 % |
| Multi-sudoku: Orb 3 - Christmas snORBall by DiMono (on 20. December 2021, 18:14) | 25 | 99 % |
| 真笑Puzzles045--Chaos Construction--ZhangYi004 by cdwg2000 (on 8. March 2022, 15:53) | 25 | 100 % |
| Masyudoku (Masyu/Latin Square/Loop Sums/Ambiguity) by dumediat (on 30. September 2022, 02:35) | 22 | 95 % |
| Evolution by grkles (on 10. March 2023, 12:16) | 75 | 91 % |
| A Horse with No Name (Broken 159) by purpl (on 2. January 2022, 18:01) | 42 | 96 % |
| Killomino by josh_johnson (on 9. July 2022, 04:16) | 47 | 93 % |
| Consistency (Equalines Sudoku) by Mad-Tyas (on 6. November 2023, 08:46) | 46 | 96 % |
| Black-dot Mamba by yttrio (on 10. November 2023, 20:55) | 90 | 98 % |
| Four Corner Shots by noswald (on 25. May 2024, 18:28) | 46 | 95 % |
| Waben Summenkropki Invers und knapp daneben by Luigi (on 3. February 2010, 14:09) | 47 | 95 % |
| UNPROBLEMATISCH - Buchstabenrätsel by DocLogic (on 1. January 2020, 13:06) | 48 | 92 % |
