How do you make your pet level up on msp?

To level up your pet on MovieStarPlanet (MSP), you need to feed it, play games, and complete activities that earn it happiness and experience points. Engage in various mini-games and participate in quests to increase your pet's level. Additionally, you can use pet food and toys to enhance their happiness, which contributes to the leveling process. Regular interaction and care are key to leveling up your pet efficiently.