Moshi Monsters was a British web browser 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 (Diavlo, Luvli, Katsuma, Poppet, Furi and Zommer) 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 these has been disputed.
On November 13, 2019, it was announced that Moshi Monsters would be closing down on December 13, 2019 due to the end of support for Adobe Flash Player.On December 13, 2019, the game's servers had shut down as planned.