Multiplier Chests are a way to multiply your Stars and Coins after completing a level! They come in four different types and each one contains higher multiplier options than the next:

At the beginning of each level, you will start with a Diamond Chest. Each time an incorrect letter is chosen, you risk being downgraded to the next lesser Chest. Each Chest gives two chances before being downgraded and it is possible to not receive a Multiplier Chest altogether. For this reason, be sure to choose the letters you input wisely!

After completing a level, the Multiplier Chest will open and give you three possible Multiplier options to choose from.