I'm stuck on
A. 8
A.B. 1
B. 18
On B. 17 I got the right arrow to the room to the right and a boom from B. 18 to get that button, but I don't know how to get the left arrow from B.17 to the room to the right and down.
Also on A. 2 I don't know how to get to the button.
I'm pretty stuck so some hints would be nice.