(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 | |
|---|---|---|---|
 | Grand-Prix 2019 Leftover: Regionales Yajilin by JonaS2010 (on 13. March 2020, 18:19) | 44 |  93 % |
| The XV Killers (XV Series #1) by Stavros96 (on 14. September 2020, 16:00) | 39 | 97 % |
| Sherlock's advice to the good Dr. Watson by HalfBakedLunatic (on 4. June 2023, 15:36) | 81 | 98 % |
| Dominoes in a fish tank by egubachu (on 23. April 2024, 20:03) | 43 | 91 % |
| Kakuro-Suguru Chaos Construction by mathpesto (on 25. January 2023, 20:05) | 85 | 97 % |
| 0123-Rätsel (4) by BFaw (on 16. June 2016, 10:00) | 39 | 92 % |
| Wichtel 2017 (11): Doppelte japanische Summen (mit Baukasten) by wichtel (on 11. December 2018, 09:05) | 44 | 96 % |
| Eine Handvoll U-Bahnen (Teil 4) - Relationen by Zzzyxas (on 18. February 2022, 22:50) | 43 | 99 % |
| Prison Break by Myxo (on 9. July 2023, 11:51) | 100 | 97 % |
| Bagels & Deli by ICHTUES (on 3. September 2023, 06:00) | 44 | 97 % |
| Cranial Pain by riffclown (on 24. February 2025, 16:39) | 47 | 93 % |
| OutsideTheUsula by Palfly Kampling (on 4. July 2023, 01:47) | 52 | 91 % |
| Little Killer Sandwiches Sudoku by Jesper (on 6. June 2020, 13:53) | 59 | 95 % |
| Frak Redux (Ten Lines) by tallcat (on 25. October 2023, 09:00) | 55 | 95 % |
| Chaos Construction: Sightlines by Jay Dyer (on 5. March 2022, 16:15) | 69 | 98 % |
| Asterisk (palindrome killer sudoku x) by clover (on 23. November 2020, 16:01) | 86 | 94 % |
| Full House by juggler (on 20. June 2024, 01:17) | 92 | 97 % |
| Stranger in a Strange Land by Wuschel (on 24. February 2025, 10:58) | 94 | 98 % |
| Milchstraße (Sektor 23C) by usp (on 5. November 2014, 00:00) | 40 | 95 % |
| Skyscraper Aquarium Sudoku by Sam Knott (on 23. June 2020, 18:01) | 32 | 96 % |
