Hidden adventure

Is it just down to trial and error? There are far too many options to try them all and no way of knowing if you are on the right lines??? I give up!!

@Jom if you rotate the game so the water is in front of you , you can see that part where the metal pipes form a bow/gate. You can tap there on the ground inside that to see if you got the first part.(then you'll see if B comes through) The second "tapping point" is that piece of grass where you should go up. The third one is on the second "floor" (with the bricks) where you should go up again.
So it's not as impossible and hard as it seems.

@Ginger Yes, that's more or less what I was doing. I got there at last, but there really are too many variables to have to go through all the possible combinations until something finally works.