A1-4

Hint
"The gate is broken but you can raise it!"

Solutions

 * Place a Slide (Toy) next to the Blue Button, then place a Rock on the Slide
 * Place a rotated (use L1 or R1) Conveyor Belt next to the Blue Button, then place a Crate on the Conveyor Belt
 * Place a Friend next to the Blue Button, then place a Ghost on the left side of the Friend to scare him into the Blue Button
 * Place something large in the with the Blue Button that can wedge itself against the wall on the other side and the button itself, such as a Perpetual Motion Machine