CryptoKitties is a blockchain based video game developed by Axiom Zen that allows players to purchase, collect, breed and sell various types of virtual cats. It represents one of the earliest attempts to deploy blockchain technology for recreational and leisurely purposes. The game's popularity in December 2017 congested the Ethereum network, causing it to reach an all-time high in transactions and slow down significantly
it completely changes the way you look at digital copies because now a days everything digital is a copy and not the original thing.