Two types of Frame Advantage exist in fighting games, which may or may not be identical depending on the game: Frame Advantage on hit and Frame Advantage on Block. In both cases, the Frame Advantage of a move is indicated by a number preceded with either a "+" (to denote advantage) or a "-" (to denote disadvantage). The number indicates how many frames (a unit used to denote in-game time) either character is able to act before the other. Most fighting games, including M.U.G.E.N, usually run at a frame rate of 60 frames per second (or fps).