Mewberty is a special transformation that occurs in the game Monster High: New Ghoul in School. It happens when a Mew Monster reaches a certain level of maturity, allowing them to evolve into a more powerful form. This transformation is often accompanied by changes in appearance and abilities, reflecting the growth of the character. In the game, Mewberty is a significant milestone for players, as it enhances gameplay and introduces new challenges. Players must navigate the changes that come with Mewberty, making strategic decisions to maximize their character's potential and adapt to their new abilities.