Webkinz
Adorable plush animals from Canadian maker Ganz that came with a Secret Code—enter it online, and a virtual version appeared in Webkinz World, your own customizable digital space. Feed it, play mini-games, decorate its room, and if you neglected it too long, it'd get cranky. The plush-plus-online hook made Webkinz a mid-to-late 2000s obsession, especially among kids who'd aged out of Tamagotchis but weren't ready to leave their digital pets behind.