(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 | |
|---|---|---|---|
 | Rank Up 16 - Yin Yang by ralphwaldo1 (on 12. September 2024, 23:49) | 16 |  98 % |
| Ninth Court by Tyrgannus (on 28. October 2021, 13:36) | 50 | 96 % |
| Arr Arr (Doubler Arrow) by ICHTUES (on 14. August 2022, 06:00) | 56 | 97 % |
| ∞ Interfering Loops ∞ by ElChiglia (on 18. October 2023, 18:37) | 35 | 96 % |
| Juni Domino Monat (2) - Hochhausdomino by Richard (on 8. June 2012, 12:00) | 51 | 96 % |
| Pebbles (Ambiguous XV/kropki pairs sudoku) by Qodec (on 13. August 2023, 11:59) | 53 | 92 % |
| XV Kropki Sudoku by Philipp Huber (on 28. November 2020, 15:14) | 75 | 94 % |
| A BAD IDEA by PrimeWeasel (on 31. January 2021, 12:10) | 16 | 97 % |
| Juosan Division by Jay Dyer (on 16. December 2021, 23:30) | 17 | 97 % |
| 3 Snakes 2 Puzzles by the_cogito (on 19. June 2022, 18:41) | 51 | 93 % |
| Little Talks 2 by djorr (on 8. August 2022, 14:00) | 19 | 93 % |
| Quintessence [Pentominous Fillomino] by MicroStudy (on 29. June 2023, 21:28) | 71 | 97 % |
| 200 Light-years to Zetamath (Intro to Black Holes, Part IV) by heliopolix (on 27. August 2023, 19:02) | 20 | 93 % |
| Jello by zetamath (on 1. October 2023, 15:25) | 79 | 93 % |
| Equality Cube by Sniglett (on 4. December 2023, 00:56) | 38 | 98 % |
| Somedokus Are Friendly Dokus by juggler (on 15. April 2024, 20:39) | 35 | 95 % |
| Icarus by Fool on Hill (on 24. August 2023, 20:47) | 48 | 93 % |
| Ghost Python 2 (Clone Snake Sudoku) by peterchayward (on 29. July 2020, 19:16) | 45 | 95 % |
| Distant Relations #1 by Big Tiger (on 25. January 2021, 10:00) | 20 | 94 % |
| Whirlpool by Xailran (on 20. September 2021, 13:04) | 17 | 91 % |
