Monster Strike (モンスターストライク, Monsutā Sutoraiku) is a mobile Japanese role-playing physics game with elements of puzzle, strategy and cooperative multiplayer. It is developed by XFLAG for iOS and Android platforms. The game was created by former Capcom game designer Yoshiki Okamoto. In Japan, its name is often shortened to MonSt (モンスト, Monsuto). The game can be summed up as a cross between Nintendo's Pokémon and Capcom's Metal Walker; the former in that it centers around monster collecting and the latter in that battles take place using catapult mechanics.