Coins are an essential Currency and have many different uses in the game. 

Coins can be used to:

• Purchase Monsters, Structures, Decorations, Costumes and Islands
• Upgrade Castles and other Structures
• Bake Treats
• Clear Obstacles
• Exchange for Shards
• Train Monsters on the Colossingum
• Transpose Monsters
• Link Monsters to a Titansoul
• Feed your Monster on Tribal Island

There are many different methods for earning Coins. Coins can be earned by: 

• Collecting Coins from your Monsters
  
• Exchanging Diamonds for Coins
• In-App Purchases
• Completing Goals
• Selling Monsters, Structures and Decorations for Coins
• Completing Colossal Conundra
• Playing the Memory Game and Spin Wheel