EDIT: If you want a bigger version look at my other model here: https://makerworld.com/en/models/172831#profileId-189833, it fits £2 coinc nicely and also includes instructions on how to add a name in BambuStudio to personalise it.

This is a little money savings puzzle box for kids, it has a slot for small change or some folded notes. The key and puzzle will only permit it to be unlocked with a single path being followed similar to a maze.