Playing the game will earn you Experience Points or XP which represents your progress as a player and allows your character to gain levels and become stronger.

When a Zombie Slayer levels up, they always receive the following bonus:
Health: 100,000
Energy: varies depending on level.
Level: Refill Amount
1:1500
360:1800
475: 2000
525: 2250
655: 2500
695: 2750
755: 3000
845: 3500
955: 4000
1100: 4500
Stamina: 1000

As usual, if your Health, Energy or Stamina maximum are equal to or lower than the bonus, your points are simply refilled to max.

Doing Outbreaks, helping your Friends and winning Battles are just a few of the ways you earn XP for your character.

Watch your back! XP can be lost if you are beaten in Battle or killed by another player, and can even drop into negative numbers if you're not careful.