Throughout all the Kingdoms will be Purple Coins. These Purple Coins can be used in each of the Kingdoms they are found in, allowing players to buy certain Costumes and collectibles from the purple side of that Kingdom's Crazy Cap Shop. Some Purple Coins won't be accessible when you first enter a Kingdom, but all will be unlocked after the Main Story is completed. In order to buy all the items from a Kingdom's Crazy Cap Store, you must find all of the Purple Coins in that given Kingdom. There is a total of 1000 Purple Coins between all the different Kingdoms.