A virtual pet simulator of an alien lifeform that crash landed on earth in eggs. They genetically mutate into different creatures depending on how well, you fed it, happy you kept it and how clean you kept it. Along with disciplining and praising when it does things wrong then right. After awhile they get to old and die, you then start off with a new pet.
Often fun for a few days, but then gets rather old.
I as much care as I could of my Tamagotchi and it turned into a Dog.
I took care of it by only the bare necessities and it turned into an Octopus.
I never really paid attention to mine and it turned into some kind of bird.