Experience is rewarded for doing quests, fighting battles, and training friends. The green experience bar located on the top right corner of the game shows how much experience you currently have and how much it will take to advance one level.

Once you fill up your experience bar, you will gain a level and the experience bar will reset. Every time you gain a level you will be rewarded 5 skill points that you may distribute towards one of your Stats: energy, health, stamina, attack, or defense.