As you play the game, you’ll gather up XP Potions that allow you to level up your Toons. These XP potions can be applied by going to your toon collection and tapping on a Toon, then tapping on the “Level Up” button.

On the level up screen, you’ll have to choose XP potions by tapping on them and then paying the gold necessary in order to level up the Toon. As a Toon levels up their stats will become more powerful, making them stronger all around.