We store the client's account information in a cookie, and we store the current level in Local Storage..
When connecting as a user, the site gets your public IP, as well as the date and time you connected in UCT, the logged in account's username, and the URL you connected to on the site. This is so we can look for suspicious activity, such as DDoS attacks, or IP ban users who are in the wrong.
When signing up to any of SuperJumpBros Games' services, your account is stored in a database with an encrypted password.