Red Stone is a free-to-play, 2.5D, massively multi-player online role-playing game (MMORPG). There are nine classes to choose from, each of which are divided into two subclasses. Characters can experience a transformation from one subclass into another. There is an array of weapons built that differ in statistics based on their prefixes and suffixes. There is also an item system based on graded rarity. Parties of up to eight people may be formed, and these groups are often required to complete secret dungeons (SDs). A guild system is available, and guild wars make up the player-versus-player (PvP) content in the game.