Rocks'n'Diamonds

I solved also level 38 !
The level 39 it's crazy
I'll try another day
Bye
Francesco bat

LOL
When i wrote this post, after 5 minutes I have passed the level and i don't understand what i did
Now i can not pass the level 38 !
I read in this forum an old post of an invisible sand, but i can not found it.
Bye
Francesco bat

Hi !
I am new here !
I can not pass the level 37 because the number of the diamonds is less than the goal.
I try to kill the bugs but they generate a short of diamonds.
The bug up to right, it generate just 5 diamonds.
What is the solution ?
Bye
Francesco bat