(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 | |
|---|---|---|---|
 | Clockwork Yajilin: Challenger by wisty (on 5. March 2024, 23:10) | 16 |  97 % |
| Nonconsecutive sandwich killer sudoku by spxtr (on 4. August 2020, 00:53) | 54 | 91 % |
| LITSomino by mathpesto (on 23. March 2024, 15:48) | 54 | 94 % |
| Chromatic Whispers by Nahileon (on 28. September 2021, 19:32) | 35 | 93 % |
| Sudoku Variants Series (357) - X-Parity Sudoku by Richard (on 26. January 2022, 00:00) | 60 | 96 % |
| Floor Plan by the_cogito (on 15. March 2022, 20:39) | 34 | 95 % |
| Chaos Fillomino - Border Gaps #1 by Mark Sweep (on 7. December 2022, 10:00) | 32 | 99 % |
| Crawfish by jwsinclair (on 14. December 2023, 17:21) | 36 | 91 % |
| MAERZ APRIL MAI - Buchstabenrätsel / Letter Puzzle by DocLogic (on 1. March 2024, 01:03) | 28 | 97 % |
| Symmetrien 7 by julius64 (on 25. June 2011, 00:07) | 69 | 96 % |
| Down The Drain Arrow Sudoku by bram (on 18. September 2020, 21:40) | 42 | 96 % |
| Interval Sums Sudoku by Qodec (on 28. November 2021, 02:08) | 37 | 94 % |
| Jetzt gehts rund, Takashi by tuace (on 6. July 2014, 10:30) | 47 | 99 % |
| Wish You Were Here by Abdul the Killer (on 23. April 2024, 12:34) | 59 | 92 % |
| Wichtel 2011 (11): Ein 3D Japasumino by wichtel (on 14. March 2012, 09:00) | 61 | 92 % |
| Sudoku Variants Series (351) - Double Trouble Killer Sudoku by Richard (on 15. December 2021, 00:00) | 66 | 96 % |
| Smashboy by mathpesto (on 31. July 2022, 20:12) | 65 | 95 % |
| Dropsies by RockyRoer (on 12. September 2020, 12:01) | 87 | 98 % |
| Pünktchen Sudoku 4 by Richard (on 6. June 2009, 23:46) | 137 | 90 % |
| Odd Tapasyu by usp (on 29. October 2014, 00:00) | 45 | 98 % |
