(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 | |
|---|---|---|---|
 | Pentominoes Intersection by RockyRoer (on 13. September 2021, 00:54) | 26 |  99 % |
| Quorum Rings by Jay Dyer (on 23. October 2021, 17:04) | 46 | 90 % |
| Equilibrium by Mad-Tyas (on 1. November 2022, 09:41) | 66 | 98 % |
| Don't open the box by sanabas (on 4. July 2024, 15:05) | 15 | 93 % |
| Thermo Arrow Sudoku by Phistomefel (on 24. May 2021, 04:16) | 95 | 96 % |
| Antiknight Killer Sudoku by PotatoHead21 (on 15. September 2021, 05:20) | 97 | 99 % |
| Splatter by PotatoHead21 (on 23. July 2021, 03:35) | 46 | 91 % |
| Post Office Panic! by tesseralis (on 4. July 2022, 10:14) | 84 | 98 % |
| ripple by mormagli (on 29. November 2022, 22:26) | 86 | 97 % |
| Made to be Broken by jwsinclair (on 23. January 2023, 20:54) | 42 | 96 % |
| Skyscraper Slingshot Sudoku by Piatato (on 2. February 2023, 21:43) | 40 | 100 % |
| Two Truths and a Lie by zetamath (on 20. September 2021, 14:48) | 162 | 98 % |
| Ta(x)i-Cab Sums: by RockyRoer (on 6. December 2020, 13:35) | 27 | 92 % |
| Parity Paradigm by grkles (on 31. December 2021, 13:42) | 26 | 99 % |
| BERLIN - Buchstabenrätsel / Letter Puzzle by DocLogic (on 2. February 2025, 17:57) | 26 | 95 % |
| Chaotic Archery - Chaos Construction Sudoku by Mr.Menace (on 12. May 2022, 22:51) | 73 | 97 % |
| Perfectly Average Killers by Tacosian (on 14. March 2023, 03:13) | 44 | 94 % |
| Chaos Sandwich by Bert (on 24. February 2024, 16:36) | 61 | 94 % |
| Cave Fillomino #1 (10x10) by Jesper (on 29. August 2020, 11:40) | 76 | 100 % |
| 真笑Puzzles007:Bachelor(光棍) Sudoku02 by cdwg2000 (on 23. December 2020, 22:43) | 15 | 92 % |
