(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 | |
|---|---|---|---|
 | Pentomino Sandwich by RockyRoer (on 9. January 2023, 23:42) | 23 |  98 % |
| Your ways are numbered (broken 159, killer, disjoint) by Chilly (on 24. January 2022, 00:29) | 30 | 94 % |
| Snake Sum Sudoku 1 by Quarterthru (on 26. June 2020, 16:44) | 34 | 98 % |
| Hooligans Underground (Slingshot U-Bahn) by Piatato (on 29. May 2023, 21:21) | 30 | 99 % |
| Home Run by Jobo (on 21. May 2024, 21:10) | 27 | 91 % |
| Wichtel 2015 (11): Versunkenes Inselreich entdeckt by wichtel (on 27. June 2016, 21:05) | 31 | 95 % |
| 24 Rätsel in 24 Stunden (Teil 18) - Yajilin by Zzzyxas (on 24. June 2017, 17:24) | 74 | 93 % |
| Pentominous Killer Kakuro by Agent (on 10. February 2024, 09:00) | 108 | 99 % |
| Dancing Arrows (Arrow Sudoku) by FryTheGuy (on 15. June 2021, 07:42) | 45 | 93 % |
| Nonbinairo by mathpesto (on 28. May 2022, 22:53) | 46 | 98 % |
| The Mysterious Loop by Die Hard (on 15. November 2024, 04:51) | 43 | 95 % |
| Nurikabe Sweeper Sudoku by KNT (on 23. May 2022, 01:37) | 59 | 98 % |
| Windmill by lerroyy (on 13. March 2022, 20:11) | 78 | 99 % |
| Ambiguous Entropy by XeonRisq (on 28. December 2022, 23:00) | 165 | 97 % |
| Schirmflechte Krypt by Luigi (on 25. August 2009, 11:14) | 31 | 90 % |
| Quintupelblock by ibag (on 17. June 2015, 22:47) | 53 | 97 % |
| Loses Kalenderblatt April 2016 by April (on 1. April 2016, 00:00) | 32 | 98 % |
| Kropki squared sudoku #1 by Nylimb (on 20. September 2020, 07:45) | 14 | 94 % |
| The Sword by Qodec (on 22. November 2020, 19:59) | 74 | 96 % |
| Renban Dance by Qodec (on 20. May 2021, 18:27) | 45 | 97 % |
