Player XP is experience earned by a player that allows them to level up in Monster Life. Player XP is separate from Monster XP, and is primarily earned by winning Battles. Players also earn Player XP by completing Goals, but not as much compared to what's earned in a Battle.

Unlike Monsters, Player XP is not boosted by Habitats or Boosters. However, when a player earns enough Player XP, they gain a level and are provided with Gold and Crystals as a reward. Levels gained by earning Player XP also allow the player to unlock new Monsters and Buildings as the game progresses.