(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 | |
|---|---|---|---|
 | Samurai Sandwiches by mathpesto (on 28. December 2022, 17:34) | 64 |  95 % |
| Constellation Sudoku by Gliperal (on 29. August 2020, 10:08) | 18 | 92 % |
| Leapfrog Sudoku by stephane.bura (on 3. December 2020, 20:00) | 18 | 97 % |
| A BAD IDEA by PrimeWeasel (on 31. January 2021, 12:10) | 17 | 97 % |
| Disjoint 258 Sudoku by Qodec (on 8. October 2021, 18:05) | 61 | 94 % |
| Juosan Division by Jay Dyer (on 16. December 2021, 23:30) | 18 | 97 % |
| Twenty-four and what? by andreasv (on 8. March 2022, 07:37) | 24 | 92 % |
| Skyline by FinnishGuy (on 6. May 2022, 22:24) | 19 | 92 % |
| Sum Killer Between Us by XeonRisq (on 4. July 2022, 17:00) | 43 | 96 % |
| Was it a car or a cat I saw? by Angelo (on 20. July 2022, 21:23) | 19 | 98 % |
| Campsite #3 by PrimeWeasel (on 24. January 2023, 20:40) | 17 | 97 % |
| Anti-Z by Christounet (on 19. April 2023, 00:18) | 38 | 97 % |
| Double Squished by Prof.Dori (on 14. December 2023, 01:57) | 18 | 94 % |
| J.O.E. by JayForty (on 7. February 2024, 14:42) | 84 | 97 % |
| XV*3.2 by NurglesGift (on 26. July 2024, 10:05) | 158 | 97 % |
| Infiltration by XeonRisq (on 19. February 2025, 22:00) | 20 | 92 % |
| Wichtel 2017 (5): Japanische Weihnachtskoralle 2358 by wichtel (on 31. May 2018, 09:05) | 48 | 96 % |
| Crawfish by jwsinclair (on 14. December 2023, 17:21) | 37 | 91 % |
| Negative X plus V by TheGreatGoatsbie (on 7. August 2024, 20:10) | 115 | 94 % |
| Symmetrien 7 by julius64 (on 25. June 2011, 00:07) | 69 | 96 % |
