Cryptokitties is a fun website that allows users to earn cryptocurrency by playing games.
The aim of the game is for you to feed and raise cats that are provided to you by other players, earning bitcoins for each kitten you take care of. You will be able to earn more money if you breed the rarest cats.
Users can deposit cryptocurrency via Matemask, which CryptoKitties supports. This is, in my opinion, one of the most useful features, and in order to use it, you must connect your Matemask wallet after completing the registration process. There is no reason to be concerned about the issue of trust. All of your transactions are recorded in the block chain since Cryptokitties is built on the Blockchain.