Cachebox Cachebox is a zk-app escape game built on the MINA blockchain. Hosted at zk-cachebox.herokuapp.com. Cachebox is an escape game where you start on the beach and are faced with classic riddles and puzzles, the solutions to which unlock your path. What makes this game unique is that it uses a smart contract to verify correct solutions, but unlike a traditional blockchain, transactions do not spoil the game. The way the smart contract works means that a user can prove they know the solution to a puzzle, without revealing the solution itself. The source code can be reviewed at https://github.com/qcomps/cachebox. If you get stuck, you can look for hints in the cabin at /play/in_shack, and you will find a list of winners there as well.