(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 | |
|---|---|---|---|
 | Country Road Fillomino #2 (12x14) by Jesper (on 25. October 2022, 08:02) | 47 |  100 % |
| Back to Entropia (Skyscraper, Entropy) by Mad-Tyas (on 20. November 2023, 10:46) | 59 | 98 % |
| Double the Heat by Jay Dyer (on 17. September 2022, 21:55) | 34 | 99 % |
| absolute annihilation by aqjhs (on 6. December 2024, 06:12) | 29 | 92 % |
| Chaos Construction: Red Team / Blue Team by KNT (on 4. May 2024, 06:24) | 52 | 96 % |
| Arrow Sudoku - The Nightmare by emmettcito (on 19. January 2021, 20:36) | 30 | 98 % |
| Jellyfish by grkles (on 15. October 2021, 01:49) | 24 | 98 % |
| Gridlock by FryTheGuy (on 14. November 2021, 01:13) | 21 | 98 % |
| Overlarge by Jay Dyer (on 1. May 2023, 14:40) | 64 | 98 % |
| Negatively Constrained Exploded Compass Sudoku by stephane.bura (on 8. March 2021, 09:00) | 15 | 100 % |
| Wichtel 2020 (4): Memo an den Weihnachtsmann by wichtel (on 27. April 2021, 02:02) | 13 | 98 % |
| Possimpible by Jeet Sampat (on 5. November 2021, 06:19) | 15 | 92 % |
| Trident by randall (on 6. January 2023, 23:46) | 16 | 94 % |
| Second Region X-Sums Chaos #2 by Elliptical (on 18. January 2023, 22:58) | 15 | 92 % |
| Sandwich gone BAD by PrimeWeasel (on 3. March 2023, 17:59) | 13 | 100 % |
| Wichtel 2022 (6): Das Kleckskakuro by wichtel (on 4. October 2023, 13:13) | 14 | 98 % |
| Soap Opera by Jay Dyer (on 28. January 2024, 21:19) | 29 | 96 % |
| Clockwork Yajilin: Blackout Cipher by wisty (on 19. March 2024, 22:26) | 14 | 96 % |
| A Map to Distant Lands by The Book Wyrm (on 23. August 2024, 18:11) | 14 | 92 % |
| Cityscape (Gravity/Counting Snakes) collab with Chad by dumediat (on 26. October 2024, 14:17) | 13 | 90 % |
