Launch Pet Rift and ensure you're connected to the server. Upon joining the game, press the Three Dot or the Burger button on the left side of your screen.

Launch the Pet Hatchers game on the Roblox app. Click the Code button with the YouTube icon on the left side of the screen. Copy and paste one of the working codes into the text box.

You can get more pet slots in Grow a Garden on Roblox – but it'll cost you. Grow a Garden starts you with just three slots, though you can eventually unlock five more for a total of eight pets.