How do lives work?
You can have 5 lives maximum. You lose a life if you can’t complete level targets successfully. Each life is renewed after 30 minutes. You can get more lives by asking your friends or using Crystals to buy them.
How can I ask friends for more lives?
You can click on the plus icon on your "life" bar and then you need to click on Ask Friends button. You can also check the below image to understand the process better.