(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 | |
|---|---|---|---|
 | Shuriken by XeonRisq (on 4. June 2023, 22:00) | 62 |  94 % |
| Hashiwokakero by Myxo (on 19. September 2023, 08:25) | 27 | 96 % |
| Jubiläumsrätsel - 4 Jahre Rätselportal by Richard (on 1. November 2012, 00:00) | 87 | 98 % |
| Chaos Construction: Akari by Niverio (on 25. June 2022, 21:28) | 45 | 98 % |
| Steckkisten (3) by BFaw (on 25. August 2013, 14:00) | 19 | 90 % |
| Carpet Sudoku III: Cleopatra's Tryst by jackisaacbryan (on 26. September 2020, 22:49) | 21 | 98 % |
| V's by ICHTUES (on 23. May 2021, 06:00) | 19 | 93 % |
| Amnesia by Dave252 (on 3. August 2021, 16:37) | 19 | 98 % |
| Star Nurikabe #47 by BenceJoful (on 31. August 2021, 18:04) | 40 | 98 % |
| Whispering Skyscrapers by Florian Wortmann (on 9. January 2022, 13:22) | 41 | 93 % |
| Zig by grkles (on 29. May 2022, 20:40) | 50 | 96 % |
| (1)59.(4) by twototenth (on 31. May 2022, 08:00) | 35 | 96 % |
| Canal View Sudoku by KNT (on 27. July 2022, 03:51) | 58 | 97 % |
| Entropic Tiles by crispy16 (on 3. September 2022, 22:58) | 23 | 97 % |
| Escape the Programmer's Vortex by Oddlyeven (on 31. March 2023, 02:45) | 17 | 93 % |
| Euler Knights by Raumplaner (on 6. April 2023, 17:34) | 38 | 95 % |
| Bloodsuckers by ViKingPrime (on 8. April 2023, 12:00) | 19 | 91 % |
| Arvada - a Beachcomber Sudoku by glum_hippo (on 3. November 2023, 04:20) | 55 | 96 % |
| Naughty Negative Snake by starwarigami (on 6. March 2024, 00:00) | 38 | 91 % |
| Some Zippers Somedoku by blackjackfitz (on 16. April 2024, 01:59) | 56 | 97 % |
