You have various worlds in a solitary story. You start in Austria with 60 levels. If you have enough stars you can go to the next world, namely Bali, then you can continue to Italy, Japan, Iceland, the great Barrier Reef, Egypt, Arizona, Paris and finally Tanzania. Together these are more than 350 levels. So you are still busy playing this game!
You can find daily and weekly events in the game. By coming back every day you can unlock new challenges. Some of these events are: Collect an X number of stars, delete a certain number of cards or delete a total number of cards. These challenges give you extra coins that you can use in the shop.