In this guide I will try to help you.
There is a wall on the level 6 puzzle that makes it hard to tell if everything is put together correctly or not.
You should just randomly sort out this section of the puzzle where the wall is by trial method. The problem area is highlighted in red in the screenshot.
Just try to move the puzzle to the right - to the left and vice versa in these places.
And over time, you will definitely be able to get the picture as it was intended by the system. And you can continue playing.
You can also try to remember all the marks on the walls, etc. and try to repeat it in the game according to my screenshot provided below: