Follow Metamask instructions to create your Ethereum Wallet.
Purchase some ETH from any exchange.
Coinbase is an easy place to buy.
After you purchase your ETH in Coinbase, you will need to transfer them to your Metamask Wallet address
From Ethereum Wallet App Browser, Navigate to
https://cryptotitties.fun/sign-in/
For U.S. citizens: You can buy ether (ETH) in MetaMask with the integrated Coinbase.
For everyone else: Purchase some ETH from any exchange. Coinbase is an easy place to buy. After you purchase your ETH in Coinbase, you will need to transfer them to your MetaMask Address. You will then be ready to purchase some CryptoTitties.