To go to the store, click on the corresponding icon in the upper left corner of the screen.
In the game store you can buy everything you need for the game: heroes, game currency: (Mystic Gold or Fusion Coins), and energy.
You can exchange one resource for another if necessary. For example, exchange Mystic Gold for energy.
Also in the shop you can choose to watch ads and get Mystic Gold or energy for it.
