Creating an account isn’t required to get started. It is helpful though. 

For example, if you change phones, an account will let you keep your profile information and settings on the new phone. You’ll just need to log in to the app using your account on your new phone. With an account you can also review your stats from the Player Dashboard on the web.

You can create an account using your email or using your Facebook or Google+ account.

Here’s a step-by-step guide (with pictures!) to create a new account.