There are two ways to end the solution, although both employ the same route and objective:
~ to transfer the large square at the top of the puzzle to the center space at the bottom ~
Most sliding block puzzles use a 'closed' case, but a few like Psychotease -- Bricks -- Forget Me Not -- L'Ane Rouge
use an opening at the bottom to allow the large square to exit the frame, the donkey finally being able to relish his treat:
A Bunch Of Carrots !
(Of course, there can be no cheating by using the exit space for anything but the large square.)