Lives allow you to start playing a level.

If you don't have any Lives, you'll be unable to start a game.As a rule, the maximum number of Lives you can have is 5.
Every time you fail a level, you will lose one Life.

You can also get Infinite Lives as a reward for completing levels or as Daily Rewards. Alternatively, you can go to the Shop and buy an item pack containing Infinite Lives as well as lots of other goodies.

One Life is restored every 20 minutes.
You can also refill your Lives by tapping the corresponding icon in the top left corner of the main menu and selecting an appropriate option.

Watch an ad to restore 1 Life or refill all 5 Lives immediately in exchange for Diamonds.