(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 | |
|---|---|---|---|
 | El Psy Kongroo by lerroyy (on 21. July 2022, 04:00) | 39 |  97 % |
| Watchtower sudoku by Lizzy01 (on 1. August 2022, 10:24) | 20 | 95 % |
| Double Negative by DadJokes (on 4. October 2022, 13:35) | 18 | 91 % |
| Modern Wall by XeonRisq (on 29. March 2023, 19:00) | 17 | 98 % |
| Doubler Trickery by Mad-Tyas (on 12. October 2024, 12:33) | 20 | 92 % |
| The Ballad of Buster Scruggs by SamuPiano (on 4. February 2025, 15:44) | 37 | 95 % |
| Erratic U-Bahn by Agent (on 13. June 2025, 09:00) | 20 | 100 % |
| Castle Wall Delta #2 (15x15) by Jesper (on 1. June 2021, 08:38) | 58 | 98 % |
| Chaotically Coordinated Arrows by Piatato (on 3. March 2022, 19:58) | 61 | 98 % |
| Crypto Japanese Cave (2) by KNT (on 13. October 2022, 23:25) | 63 | 100 % |
| Diagonality by The Book Wyrm (on 15. September 2025, 23:59) | 64 | 92 % |
| Squares with Chaotic Circles by thoughtbyte (on 18. January 2024, 09:07) | 44 | 99 % |
| Kashmir by lerroyy (on 29. March 2022, 20:26) | 53 | 96 % |
| Chaos Construction: Liars (8x8) by Gliperal (on 22. April 2024, 20:38) | 23 | 93 % |
| Urban Madness (Chaos Construction) by Mad-Tyas (on 23. August 2025, 05:05) | 26 | 92 % |
| Taijitu (ft. KNT) by TotallyNormalCat (on 26. May 2022, 18:00) | 54 | 95 % |
| Old Maid by ICHTUES (on 5. February 2025, 23:34) | 63 | 98 % |
| Bubble Trouble by Stavros96 (on 16. March 2021, 12:01) | 31 | 98 % |
| The Great Overlap by filuta (on 2. February 2024, 16:27) | 27 | 98 % |
| Greedy Cages Sudoku by Phistomefel (on 3. May 2022, 22:41) | 73 | 99 % |
