(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 | |
|---|---|---|---|
 | Why sooo serious ? [2T1L Deconstruction] by Christounet (on 25. April 2024, 22:59) | 29 |  95 % |
| Chaos Construction: Numbered Regions #1 by Jesper (on 24. September 2022, 15:15) | 141 | 100 % |
| U-Bahn mit Haltestellen III by tuace (on 28. March 2016, 16:22) | 40 | 97 % |
| Sudoku Variants Series (373) - Four Winds Killer by Richard (on 1. June 2022, 01:00) | 49 | 93 % |
| X Zip Line by antiknight (on 29. November 2023, 19:36) | 46 | 96 % |
| Six-pack Linked Sudokus #10 - Sums by Genomico (on 30. September 2022, 16:30) | 27 | 100 % |
| Who Stole the X's and V's?! by LittleNightmaresLady (on 22. April 2023, 18:05) | 29 | 94 % |
| Killer Cave by udukos (on 7. October 2021, 06:12) | 54 | 99 % |
| Isolation by Nahileon (on 21. January 2022, 14:41) | 55 | 94 % |
| Foghqwhgads by ThePedallingPianist (on 9. February 2023, 23:55) | 65 | 95 % |
| Four By Four by IcyFruit (on 29. February 2024, 17:13) | 54 | 96 % |
| Kropkiflotte auf hoher See II by Luigi (on 30. October 2014, 13:51) | 14 | 93 % |
| Magic Sandwich Sudoku by Madmahogany (on 10. May 2020, 20:22) | 25 | 99 % |
| Mysterious Samurai (Hard Ver. of Sudoku Challenge 2020) by Kwaka (on 12. September 2020, 23:40) | 16 | 93 % |
| NonoSums by Mark Sweep (on 4. October 2020, 20:41) | 15 | 98 % |
| Chalice (Anti-knight, Thermo) by emmettcito (on 23. April 2021, 19:21) | 42 | 92 % |
| Mosaic cogs [Extended diagonal XV - virtual sudoku] by SimplePurpleFrog (on 2. November 2021, 04:05) | 23 | 100 % |
| Castle Wall / Yin-Yang #2 (13X13) by MagnusJosefsson (on 27. December 2022, 13:28) | 47 | 99 % |
| Lighthouse Nurikabe by Gliperal (on 8. February 2023, 20:57) | 13 | 93 % |
| Killer Kropki Cages sequel by Ryx (on 28. March 2023, 06:45) | 13 | 91 % |
