Catz for the Nintendo Game Boy Advance is a virtual pet simulation game belonging to the pet simulation genre. Players adopt, care for, and play with their own virtual felines. They have the option to choose from various cat breeds, each with distinct personalities and needs. The gameplay involves feeding, grooming, and engaging with cats through toys and activities to keep them happy and healthy. The game also allows players to accessorize their pets with costumes and items to customize their appearance, creating a unique and personal pet-owning experience on the go.