BoxCell is an ancient oriental game. In this warehouse however all the boxes are hollow and open on one side, in addition they can only be moved by pushing from the inside (rather than the outside).
There are two sizes of boxes, small and large, the aim is open the door, escape the cell. but first to push the small red box inside the large red box. Black boxes may help or hinder your progress.
Hint… a small box inside a large box can be pushed together.