9 Pets Equipped

The 9 Pets Equipped upgrade is an Impossble upgrade. The category says right for now as it is literally impossible to get, even to VIPs, since only 4 worlds are present as of 08/12/2019. But even if we take way that consideration, this upgrade will be the hardest one to get, as all of the other requirements be taking a while anyways. It is not the most game-changing upgrade in the game, but is still quite rewarding.