3. Tamagotchi – 1990’s
Tamagotchi was the world’s first digital pet. It came on a keychain, you carried it around with you, it became your child. A child with 3 buttons that you use to feed it, change it, burp it, put it through college, watch it use up all of your retirement funds, etc. Okay fine, I may have made up a few of those. Outside of the original Atari 2400, anything with less than 3 buttons is not going to be much fun.