Tamagotchi

https://en.wikipedia.org/wiki/Tamagotchi

Bandai with WiZ, creators Aki Maita and Akihiro Yokoi; Japan release 1996-11-23; Hunger, Happy, and Training meters, life stages, care-dependent adult form, droppings and sickness, death; about 40 million units in the first run.

Care-dependent development, Creature care, Real-time clock, Tamagotchi