Box with a size of 70-70-70 cm.Inside there is a place
where the Joker mask should be located and also
an LED backlight. From the outer part of the box there are
display and keyboard. Whole box is decorated both
from the external and internal
sides. There is also a mask of the Joker itself
(or some other character) and magnet lock
(or electro-mechanical lock). Players need to enter the right code(code is programmable)
and put the mask on a right place.
After this is done there magnet lock will open and laugh of Joker will be played.