Spoiler: Trick List - springboard stairs (with B on the stairs, tap behind B and then in front of B) - auto pilot (tap and move slider to redirect B) Spoiler: Video Solution
All the gameplay can be seen before B starts the level but there are enough interesting moves and subtle touches to make the level very satisfying.
Spoiler I really wanted to place B beside the ball so that B will serve as a wall to prevent the ball from falling. Killing B with Z was soooo satisfying . I love the parts where the draggable should be dragged down slowly but surely and the other draggable should push the ball with just the right amount of force.