Each kit has some moving mechanical component to it. The little fidget kits have a gear to spin around while the stagecoach has opening doors, boxes, and can move on its own after a few twists of the winding key.
The kits can take anywhere from 10-15 minutes for the simple ones up to 16 hours or more for the more complex ones.
If you don't use the easy to follow step by step instructions they can be turned into a challenging puzzle as well!
