Koko-chan wasn't a real game. It was an urban legend from the early 2010s, a supposed "tamagotchi-style" virtual pet that was pulled from the market after users reported strange glitches—text messages from the app, sounds playing while the phone was off, and a file size that grew larger the longer you played.
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When looking for games, it is much safer to use official platforms like the Google Play Store Apple App Store Koko-chan wasn't a real game