Coin & Dragons have 4 ways to log-in.
1. Guest
2. Apple Game Center(iPhone users only)
3. Google Account(Android users only)
4. Facebook Account

When you play the game by 'Guest', be careful the below.
1. If you connect to another account, your data of 'Guest' is connected to the account.
2. If you delete the game before connecting to other accounts, your data of 'Guest' is deleted.

When you play the game, please manage the account carefully.