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The Block Fort is a battle course in the Mario Kart series. It first appeared in Mario Kart 64 with four structures in each corner of the level. Ramps lead up to the first level, where thin bridges lead to the other forts. Another ramp leads to the top level, with longer bridges to the other forts roofs. Item Boxes are on the ground levels edge-wall, and on both of the forts' levels.
Mario Kart 64 instruction booklet: The map consists of a series of floors, each three levels high. The four blocks are colored red, yellow, green and blue so you can quickly check your opponents' screens to find their locations.
Mario Kart 64 web page: Block Fort is a multi-level arena with three levels of platforms linked by ramps and elevated roads. The four blocks that make up the arena are color coded so you can tell where your opponents with a glance at their screen.
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