In 1996, Bandai sold 82 million Tamagotchis. Kids carried egg-shaped plastic keychains everywhere, frantically pressing three buttons to feed, clean, and play with a pixelated blob that would literally die if you ignored it during math class.

It was the first time millions of people felt genuine emotional attachment to a piece of software.

30 years later, I rebuilt that entire experience — in the browser, with TypeScript, zero dependencies, completely open source.

No app store. No download. No install. Just open a tab and adopt your pet.

And in the process, I learned more about state machines, game loops, and emotional design than any computer science course ever taught me.