The Butterfly Event is a limited-time event that unlocks at level 21. During this event, butterflies will appear in levels, and you must merge fruit near them or next to obstacles they are sitting on to free them. If you win the level, all collected butterflies will contribute to a progress bar. The more butterflies you collect, the better your rewards! The event runs every Monday, Thursday, and Saturday at 10 AM GMT and lasts for 36 hours.