Three cubes are connected.
It is impossible to separate them.
One of joining plates is the key.
If you slide the 1st step plate of one box, you can not open the other twoboxes.
It takes 38 (8+7+8+7+8) moves to open all the lids at the same time.

This box is completely different from Snake Cube (KW-6).
I developed completely new mechanism.