Pet Simulator X is a highly successful, former top-tier Roblox game by BIG Games Pets with over 8.9 billion visits, which, despite being succeeded by Pet Simulator 99, maintains a dedicated player base for trading rare pets. While active, development halted in late 2024, and users should be aware that some,1 unofficial third-party versions have been flagged for potential malicious activity. For more details, visit BIG Games Wiki .