RoK uses text and graphical interface elements, and a turn-based action system. Unlike most MUDs, RoK uses a proprietary client to connect to the server instead of telnet or a MUD client such as zMUD.
Players create characters based on ten races and twelve classes, each with unique attributes and skills. The game world has been developed into thousands of rooms, items, and monsters, creating a rich environment complete with a well-developed history and religion system.
PvP combat is a strong focus in the game, and is not optional although new characters are protected from the attacks of other players until they reach level 9. While the game is by definition an RPG, the RP community in RoK has dwindled in recent years, and combat, leveling, and trade have taken the primary focus.