In the main area of the game, before you go off on your adventure, you have the ability to access Tournaments. The Tournaments are a Super Boss Rush where you are set against multiple Super Bosses within a time limit. If you success, you will get a reward and go to the next round.
You can only participate in 1 Tournament attempt a day, having to wait in order to try again if you lost or move to the next round.
In Version 1.2, this turned into Coin Rush Mode.