Rumble Fighter is a free-to-play, 3D, casual fighting massively multiplayer online game developed by WeMade Entertainment and Nimonix, and published by Online Gaming Planet(OGPlanet). This is the English version of Gem Fighter(젬파이터). Rumble Fighter North America(RFNA) can only be accessed by people residing in the U.S. and Canada. Different versions for other areas in the world are Rumble Fighter Europe(RFEU), Rumble Fighter Germany(RFDE), and Rumble Fighter Taiwan(火爆小鬥士Online).
Players are able to equip Sacred Scrolls which allows them to have a specific fighting style. ExoCores are an additional feature where players undergo transformations during battle. These transformation changes the player's appearance, gives them additional skills, and may alter their fighting style.
Players may choose to play against each other, in teams, and alone or co-op in adventure mode. Using the game exclusive currency called Carats, players are able to purchase items to alter their characters' appearance or to boost up their stats. Astros, an exclusive currency to OGPlanet may also be used to purchase certain items.