Various Tips
You can get a special prize by the end of the week along with the daily prizes if you log in every day. If you happen to miss a day, you have to start all over again.
Blue-glowing enemies can just be tapped, while you need to swipe to get rid of the orange ones.
Finishers are quite popular, but slow. You need to see whether you'll have enough time to do it.
Try to get three stars for every level. This will help you get free chests much faster.
You can start with an easier difficulty until you learn the game's mechanics and then increase it later on in the game.
All of the characters have their own unique attributes, so you can choose which one is the best for a certain level.