Moshi Monsters was a British web browser massively multiplayer online role-playing game (MMORPG) game aimed at children aged 6–12, with over 80 million registered users in 150 territories worldwide. Users could choose from one of six virtual pet monsters (Katsuma, Poppet, Furi, Zommer, Luvli, and Diavlo) they could create, name and nurture. Once their pet had been customized, players could navigate their way around Monstro City, take daily puzzle challenges to earn 'Rox' (a virtual currency), play games, personalize their room and communicate with other users in a safe environment, although this has been disputed.
The servers for the game were officially closed on December 13, 2019, due to the game requiring Adobe Flash Player, which ended support on 31 December 2020.
Mind Candy continues to actively use the "Moshi" intellectual property in the mobile app Moshi, an app featuring bedtime stories and guided mindfulness meditations aimed at children.