Pet Simulator 99 is a popular Roblox game developed by BIG Games Pets and is the fourth installment in the Pet Simulator series. In this game, players have to collect and raise many pets. As you progress in Pet Simulator 99, you earn coins and then use them to unlock pets. Every pet has special abilities, and you can also level them up by completing quests. The main goal is to explore the game's massive world to find, capture, and care for these cute pets.