Dad made this awesome box that is 16 small boxes that each open with a different key. I finally got the boxes numbered and then I made a "map" for Zoe and labeled each of the keys with a different picture. I showed her how to match up the keys with the numbers and find the correct lock to open. I put some of her Littlest Pet Shop Toys inside each of the boxes. Fun! I can change the map symbols & key tags easily and make them more complicated as she learns to read, etc.