Puppet, one of the "consequences" of Afton's actions, now has a way to torture the one who inflicted so much pain and suffering on so many innocent people!
William Afton, aka Purple Guy, is forced by the Puppet to wander through a labyrinth, an intertwining of corridors and intersections in which he must search and take drawings.
The drawings he refers to are those that children have made and hung on the walls of the famous pizzeria.