Introducing CryptoKitties (ethereum blockchain game) to the crypto world made the NFT tokens more recognizable. It was a pioneer that suceeded and it went as far as slowing down ethereum network significantly. The game is realy simple - you have a kitty that you can take care of and then if there is a relevant supply you can sell it and cash out. Above that there is no more utility. CryptoKitties has started usage of blockchain for gaming, leisure and fun but we can now find better games (more complex, more playable and funny).