(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 | |
|---|---|---|---|
 | Drunken Knights by Blobz (on 8. July 2022, 16:00) | 76 |  95 % |
| Caduceus by PjotrV (on 2. June 2022, 13:11) | 58 | 100 % |
| Palenban (Renban+palindrome sudoku) by Qodec (on 11. September 2023, 20:28) | 73 | 93 % |
| 3 Linked Sudokus by JonaS2010 (on 12. May 2019, 17:24) | 71 | 94 % |
| NATUR - Buchstabenrätsel by DocLogic (on 2. January 2020, 16:41) | 45 | 93 % |
| The Soused Snake by Big Tiger (on 30. June 2020, 02:23) | 18 | 96 % |
| Snakes Sandwiches & Chaos by emmettcito (on 8. August 2020, 04:39) | 16 | 98 % |
| Rings Around The Rosy Sudoku by RockyRoer (on 12. August 2020, 16:59) | 47 | 96 % |
| The Cross by Lisztes (on 21. March 2021, 01:00) | 14 | 96 % |
| Not Between Sudoku by stephane.bura (on 29. May 2021, 04:07) | 12 | 98 % |
| Laser ohne Innenhinweise by Uhu (on 31. May 2021, 19:48) | 14 | 98 % |
| Dalek's Dilemma by apiyo (on 20. August 2021, 04:51) | 15 | 96 % |
| Whirlpool Around 5 by Cane_Puzzles (on 21. November 2021, 08:32) | 15 | 94 % |
| Killer Sudoku: Mutated Fish by Playmaker6174 (on 20. February 2022, 11:52) | 53 | 97 % |
| The Answer by tomate94 (on 4. May 2022, 11:18) | 31 | 96 % |
| Impossible Rope Trick? by Skunkworks (on 9. May 2022, 17:18) | 19 | 94 % |
| Unbound by twototenth (on 23. August 2022, 08:00) | 33 | 93 % |
| Super Smashboy by mathpesto (on 24. August 2022, 05:07) | 66 | 96 % |
| Floppy Disks by ViKingPrime (on 14. April 2023, 09:15) | 13 | 94 % |
| Prime Viking by heliopolix (on 21. February 2024, 13:55) | 14 | 96 % |
