Fort Fire Bros.
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Fort Fire Bros, or World 
Castle-1, is the first course in the seventh world of Super Mario 3D World, World Castle. It becomes accessible by beating World 6, and its own completion unlocks Switchblack Ruins and Red Hot Run.
Layout
This level starts on a platform with a Goomba Tower surrounded by blue lava, with Fire Bros. throwing their fireballs in some nearby Clear Pipes. After another Clear Pipe network infested with Fire Bros., the player reaches some platforms with Firebars on them. Defeating a Fire Bro. on top of a Goomba Tower allows the player to enter the nearby Warp Box and proceed to the Checkpoint Flag. After passing an area infested with Thwomps, a Fire Bro., and some Blocksteppers, the player reaches a Clear Pipe which leads them to an area with a Fire Bro. which needs to be defeated in order to gain access to the Goal Pole.
Green Stars
- Green Star 1: Near the beginning, the first Green Star in inside an H-shaped Clear Pipe. (see above)
- Green Star 2: Immediately after the checkpoint, the player must unveil some invisible rectangular blocks in order to reach a green Warp Pipe. The pipe leads to a room where the player has to maneuver a green ball to a switch that reveals the Green Star.
- Green Star 3: The player has to activate the Green Ring and collect 8 Green Coins to reveal the Green Star.
Stamp
- The player must Ground Pound the ? Block in the second Firebar to levitate the player to the stamp.
