(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 | |
|---|---|---|---|
 | Even The Odd Arrow by tzael (on 28. July 2020, 09:26) | 30 |  91 % |
| Astronomic Squares Sudoku by Philipp Huber (on 7. August 2020, 10:35) | 27 | 90 % |
| Slingshot Sudoku - Confrontation by stephane.bura (on 26. August 2020, 20:00) | 28 | 96 % |
| Singularity Fever [Thermo] by Miky (on 14. June 2021, 20:47) | 31 | 96 % |
| Arrow Dynamics by SSG (on 23. June 2021, 07:58) | 35 | 97 % |
| Battle With The Archers 28: Between Friends and Enemies (part 2) by Playmaker6174 (on 14. February 2022, 02:50) | 34 | 97 % |
| Wildberry Poptart by Tyrgannus (on 4. August 2022, 11:16) | 136 | 99 % |
| Obstructed View by jwsinclair (on 5. September 2022, 19:17) | 33 | 91 % |
| Speak Of The Devil... by Perladel (on 14. September 2022, 13:33) | 37 | 91 % |
| Diversity Killer by Migu (on 4. June 2023, 00:36) | 33 | 96 % |
| Circles and Between Lines by stimim (on 7. September 2023, 07:10) | 33 | 97 % |
| Difference Of Squares by MathGuy_12 (on 6. March 2025, 16:28) | 31 | 98 % |
| Cramped for Space by XeonRisq (on 23. April 2025, 18:00) | 36 | 95 % |
| Remnant (Overlaps/Coordinate arrows) by dumediat (on 28. June 2025, 08:00) | 28 | 97 % |
| Transmission by Phistomefel (on 18. January 2023, 17:39) | 292 | 97 % |
| Teamwettbewerb 2011: Rätselstern (Runde 1) by SilBer (on 30. March 2011, 20:52) | 64 | 97 % |
| Anti-Knight Uprising by Scruffamudda (on 4. April 2024, 05:42) | 66 | 94 % |
| Sudoku Variants Series (177) - Frameless Sudoku by Richard (on 18. April 2017, 00:00) | 103 | 93 % |
| Adventskalender 2020, Türchen 16 - Twilight-Höhle by Zzzyxas (on 16. December 2020, 07:00) | 72 | 99 % |
| Smog in the City (Fog, Skyscrapers) by Chilly (on 13. January 2025, 19:52) | 83 | 92 % |
