Warning, is very expensive! This app starts out fun, til you hit level 25-30. They stop giving you boosters and you have to start buying if you want to complete another level, at all!! Its costing me $3.99 every 15-20 levels.. I needed to get to level 110. But I've been stuck on level 90 for 3 days, cause I refuse to give them any more money smh. I reached out to customer service, no response for 3 days! About to uninstall! I hate that I put so much money into a game that says its free!!!