WHAT !? I never thought that someone not french would have tried the trial. xD
There is a walkthrough in the first post of the series topic, but it's too bad to play the trial without understanding everything.
It makes me think that I should try some trials from english section before posting anything in the "Your trials" section.
In SoJ, it seems that many elements are not really in 3D in the sets. In each background, there are elements that are only there to decorate, it's normal. I took the backgrounds of the iOS version, and I turned some elements into evidences. I took what seemed to me exploitable, taking no element that could spoil the game. There are 42 (I made two more color sets for the 42th evidence).
If you want to use them yourself, you will have to do some cutting because I don't want to do 42 uploads. xD