Tamagotchi

A game based off of the little electronic device that let you raise a baby alien in real time. The Game Boy version let's you raise up to three aliens hatched from eggs though not in real time, but different growth speeds can be selected. You can play games with them, feed them when they get hungry, clean up after them, and scold them when they misbehave. You can even try to get your babies in the hall of fame by entering them into tournaments. - User Summary