(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 | |
|---|---|---|---|
 | Numbered Cave Fillomino by Agent (on 27. December 2022, 09:00) | 48 |  99 % |
| Friendly Doublers by AstralSky (on 1. February 2023, 18:41) | 11 | 98 % |
| Acropora (Chaos Construction) by Agent (on 13. June 2023, 09:00) | 82 | 98 % |
| Momohime's Human Beatbox Party by Morisenseiisgod (on 12. December 2023, 15:24) | 11 | 98 % |
| Mad Marty's Moneymaker by heliopolix (on 8. February 2024, 20:44) | 12 | 95 % |
| Toffee by pieguy (on 30. April 2024, 04:02) | 27 | 95 % |
| Skyline by XeonRisq (on 1. June 2024, 22:00) | 11 | 98 % |
| Chaotic Addition by Manta-Ray (on 7. October 2024, 13:09) | 11 | 90 % |
| The Ultimate Prime Cages by Xenonetix (on 11. June 2024, 23:45) | 87 | 97 % |
| The Female of the Species... by Abdul the Killer (on 5. March 2024, 12:34) | 92 | 97 % |
| Thermo Killer Sudoku X by Jeet Sampat (on 10. November 2021, 23:56) | 26 | 95 % |
| Bose-Einstein Condensate (S-cells) by purpl (on 18. January 2022, 17:34) | 23 | 99 % |
| Metroid by Kafkapharnaum (on 30. December 2022, 17:24) | 23 | 99 % |
| Abstract Art by marty_sears (on 30. November 2023, 02:23) | 51 | 95 % |
| Extraterrestrial Japanese Sums by KNT (on 16. February 2023, 01:26) | 35 | 100 % |
| Algebra 101 (Cipher X-Sum) by tallcat (on 29. April 2023, 09:00) | 34 | 94 % |
| I Only Have Eyes For You by juggler (on 24. May 2024, 17:47) | 36 | 97 % |
| Tower Defence #2 by Feadoor (on 17. March 2020, 09:40) | 15 | 95 % |
| Snake Sum Sudoku 3 by Quarterthru (on 4. July 2020, 00:00) | 29 | 97 % |
| Poisoned Little Killer by SenatorGronk (on 24. September 2020, 04:50) | 14 | 98 % |
