Matador (Spanish, "killer" or "bullfighter") or Matadore, sometimes called Russian Dominoes, is a domino game for two to four players using a double six set of dominoes. It is one of the blocking family of domino games in which the object of the game is to be the first to go out, while blocking one's opponents from doing so. Its distinguishing feature is the unusual rule of playing tiles so as to combine pips instead of matching numbers.