However, the expert ghost uses every trick he or she knows, including mushrooms being used at the right time, stunts being performed everywhere, and drifting right at the edge of the track. The normal ghost can be easily beaten with practice on the track. In Mario Kart Wii and Mario Kart 7, there are two developer Ghosts per track, one called Staff Ghost, and the other called Expert Staff Ghost. Mario Kart DS included one unlockable Ghost per track, which is the equivalent to an Expert Staff Ghost. The staff ghosts quite tough for beginners to defeat, as they require skilled use of mini-turbos. In the specific case of Mario Kart 64, only Luigi Raceway, Mario Raceway, and Royal Raceway have staff ghosts, which can only be unlocked by beating predetermined times. In earlier games, such as Mario Kart 64, If the player can get a fast enough time, they will unlock a ghost made by one of the developers who made the game. Throughout the games, some tracks have reused characters, such as Mario for Mario Circuit, or Bowser for Bowser's Castle. These ghosts are made by Nintendo's staff. Introduced in Mario Kart 64, there are Staff Ghosts. Koopa Troopa racing against the staff ghost of Royal Raceway,, in Mario Kart 8. In Mario Kart Wii, they can download Ghosts from the Nintendo Wi-Fi Connection, including Rival Ghosts, Champion Ghosts, and Friend Ghosts. In Mario Kart DS and Mario Kart: Super Circuit, players can download a friend's Ghosts wirelessly or through a Game Boy Advance connector, for two Ghosts per track. In most games, a player can save a Ghost per track. As a result, Ghosts cannot be saved in the Virtual Console version of the game. In Mario Kart 64, Ghosts were saved on Memory Cards. These ghosts cannot be touched and pass through karts and obstacles.

Ghosts appear as semi-transparent characters and behave as players who used them. They have appeared in most games in the series. Ghosts are replays of previous Time Trial attempts.

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