Hearts are required to begin playing a level. Aou can have a maximum of 5 hearts at a time and each life life is renewed after 30 minutes. Hearts can be lost if you do not successfully finish a level, but you can obtain more by asking your club members to send them, earning Unlimited Lives from event rewards, or using coins to buy them. By improving your prestige level, you can also unlock perks such as the ability to have up to seven hearts and reduce the renegeration time by five minutes.