Ok, but still i have problems with selectorblocks.
I have some ideas why it goes through the main tiles, probably because of that selectorblocks "spheres" and map blocks "spheres" that i use for picking are in same place.

I can detect if selectorblock is under mouse and when its not, but its not enough. I guess i have to check if selectorblocks are the first ones under mouse or are they "lower".
Some kind of Z sorting is needed or something.

Im not sure.