World fourty-eight is small, with only six normal boxes. The boxes must be placed at the center.
Step by step solution
Go LEFT, UP, push UP and UP. Push LEFT, LEFT, go UP, LEFT, LEFT, LEFT, UP, UP, RIGHT, RIGHT and push DOWN.
Go UP, RIGHT and push DOWN, Go RIGHT, RIGHT, push DOWN, DOWN, DOWN, go RIGHT, DOWN, DOWN, LEFT and LEFT. Push UP, UP, go RIGHT, UP and push LEFT.
Go DOWN, DOWN, LEFT, LEFT, DOWN, LEFT, push UP, UP and UP.
Go DOWN, DOWN, RIGHT, RIGHT, RIGHT, UP, RIGHT, RIGHT and DOWN. Push LEFT, LEFT, LEFT, LEFT, go DOWN, LEFT, push UP and UP.
Congratulations. You have completed world fourty-eight. Get ready for world fourty-nine.
For this world, the solution for Shove It! - Room 19 works as well.