One of the neighbors that I grew up with was into theater
and the family was very crafty. One day they had a bounce of
cardboard boxes "pinball size" and the such all deferent sizes
and they were all glued and plumbed together long ways and
into zig/zag formations and right angles all on the ground.
It was the "MYSTERY CAVE" once inside you had to figure
out how to get out. Sometimes you were on your hands and knees
other times you had to shimmy on your tummy to squeeze through
the small openings. and other times you came up on a dead end.
some dead ends you had to open the box flaps in order to go into
the next chamber. Cheap thrills!
kids