(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 | |
|---|---|---|---|
 | JS Whisper Yin Yang by yttrio (on 3. January 2026, 02:10) | 89 |  98 % |
| Arctic Expedition by Calesch (on 29. June 2024, 21:38) | 72 | 94 % |
| Supersquish by marty_sears (on 10. May 2026, 01:49) | 82 | 94 % |
| Killer Square Sudoku by ProwlingTiger (on 28. April 2020, 04:38) | 30 | 94 % |
| Cryptic Battlefield Sudoku by Jesper (on 18. July 2020, 19:57) | 30 | 99 % |
| Parallel Shots (Arrow Killer Sudoku) by Cane_Puzzles (on 15. August 2021, 17:14) | 31 | 94 % |
| The Spandex Sandwich by PrimeWeasel (on 4. September 2021, 10:09) | 28 | 98 % |
| Sudoku Variants Series (371) - Sudoku Hangover by Richard (on 18. May 2022, 01:00) | 64 | 96 % |
| Unplugged by Xenonetix (on 7. August 2022, 02:02) | 57 | 96 % |
| Galactic Whispers by Knickolas (on 15. July 2023, 10:24) | 61 | 95 % |
| In a Kropki Far, Far Away by yttrio (on 12. October 2024, 01:57) | 64 | 95 % |
| Fault Lines by SeveNateNine (on 20. February 2025, 07:54) | 102 | 96 % |
| La Grande Illusion by Kafkapharnaum (on 23. December 2025, 01:29) | 31 | 91 % |
| Bernis Geburtstag - Japanische Summen auf Klein'scher Flasche by ibag (on 15. June 2013, 15:25) | 38 | 93 % |
| Liar Fillomino by KNT (on 16. June 2022, 03:40) | 42 | 99 % |
| Archery Range by grkles (on 12. July 2022, 17:05) | 41 | 92 % |
| Silk Road (Aquarium Country Road Fillomino) by Agent (on 7. February 2023, 09:00) | 45 | 100 % |
| Loop Count by arbitrary (on 19. September 2024, 21:23) | 48 | 95 % |
| Brutalism (Killer Sudoku X) by PulverizingPancake (on 25. June 2021, 21:23) | 66 | 92 % |
| Arrow - Canal View by abed hawila (on 7. January 2022, 13:06) | 54 | 98 % |
