Monster Gear (モンスターギア, Monsutā Gia?), known as Mon Gear (モンギア, Mon Gia?) for short, is a 2015 mobile game created by Sega for iOS and Android devices.
Monster Gear is a free-to-play "hunting action RPG." In November 2015, to celebrate Gamera's 50th anniversary, a collaboration entitled Gamera vs. Mon Gear (ガメラ対モンギア, Gamera tai Mon Gia?) was launched, featuring Gamera and some of his enemies, as well as costumes and weapons based on them.