(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 | |
|---|---|---|---|
 | The Ballad of Buster Scruggs by SamuPiano (on 4. February 2025, 15:44) | 38 |  95 % |
| Beyond the Antihorizon (Black Hole) by heliopolix (on 7. March 2025, 18:04) | 20 | 98 % |
| Castle Wall Delta #2 (15x15) by Jesper (on 1. June 2021, 08:38) | 58 | 98 % |
| Squares with Chaotic Circles by thoughtbyte (on 18. January 2024, 09:07) | 44 | 99 % |
| Chaos Construction: 2nd Region Sight Sum (9x9) by Playmaker6174 (on 26. April 2024, 05:30) | 42 | 97 % |
| Kashmir by lerroyy (on 29. March 2022, 20:26) | 55 | 96 % |
| Chaos Construction: Liars (8x8) by Gliperal (on 22. April 2024, 20:38) | 24 | 93 % |
| Delirium (Chaos Construction) by heliopolix (on 25. October 2024, 18:14) | 54 | 99 % |
| nopil nahual by aqjhs (on 30. May 2025, 00:00) | 28 | 99 % |
| Urban Madness (Chaos Construction) by Mad-Tyas (on 23. August 2025, 05:05) | 27 | 94 % |
| Entropic Detour by Myxo (on 12. January 2026, 21:09) | 52 | 97 % |
| Taijitu (ft. KNT) by TotallyNormalCat (on 26. May 2022, 18:00) | 55 | 95 % |
| Bubble Trouble by Stavros96 (on 16. March 2021, 12:01) | 32 | 98 % |
| U-Bahn mit gemischten Hinweisen (Teil 3) by Zzzyxas (on 28. December 2019, 13:32) | 40 | 99 % |
| Mods, Quads, Odds & Schröds by ThePedallingPianist (on 17. October 2023, 15:00) | 45 | 98 % |
| Carry the Three (two-digit arrow sudoku) by clover (on 30. October 2020, 18:10) | 30 | 97 % |
| Genome by Tyrgannus (on 7. July 2021, 21:33) | 44 | 97 % |
| Stingray (Killer Sudoku) by FryTheGuy (on 13. August 2021, 05:40) | 21 | 95 % |
| Build your own samurai sudoku by filuta (on 7. September 2021, 01:37) | 10 | 95 % |
| Berceuse by ICHTUES (on 24. October 2021, 06:00) | 10 | 98 % |
