Hint 1
Observing the final state, you must fill the two gaps with the wood. So you must pile up them, to push de second on to the corner.
Hint 2
Which purple flower you can use to elevate the wood? Note that you must be on the top layer too.
Hint 3
If there's two flower, you can deduce that one will elevate you and the other will elevate the wood.
The Wall: Hint 1
four blocks is too tight to move, so you must create gaps of five.
The Wall: Hint 2
The snow that survive from top to bottom are right, right, left, right.
The Wall: Hint 3
To create de gap you must be in a diferent row of the ball