A piggy-bank designed to look like a safe.
Make sure not to discard the circle cutouts from the lid, base, and door. They are all needed.
Assemble the locking pins like this: wiggle-disc, number-disc, doorhole-disc, spacer-disc, D-disc. Glue the first three in place, but do not glue the last two. Leaving them unglued will allow you change the code, and to remove the pin from the door.