Here's the solve for the labyrinth:

L  = EXIT LEFT
R  = EXIT RIGHT
FL = EXIT FRONT LEFT
FR = EXIT FRONT RIGHT
BL = EXIT BACK LEFT
BR = EXIT BACK RIGHT

Skeleton with pickaxe:

Walk to FL,R,FL,FR,FL,FR,R,FL.

Back to cave (upper level):

Walk to BL,L,BR,L,L,L,L,BL,BR.

Back to the cave (lower level):

Walk to FR,L,FR,FL,FR,L,FL,FR,R,R,FL,FR,FL,FR,FR,R,R,BR,BL,BR,FR.

By Jurjen Bakker, jurjenb@worldonline.nl