Bowser's Highway Showdown
From the Super Mario Wiki
Bowser's Highway Showdown, also known as World 1-Castle, is the final standard course of World 1 in Super Mario 3D World. It is a castle with many Kick Bombs, with Bowser serving as the boss. the green Sprixie Princess is held prisoner in the castle. It is unlocked by completing Plessie's Plunging Falls or Switch Scramble Circus. Ten Green Stars are needed to enter and its own completion frees the green Sprixie Princess who builds a Clear Pipe to World 2.
This course begins in a road with two Kick Bombs, a Green Ring, and a Goomba Tower. If the player, in cat form, climbs on top of the wall behind these things and waits, they will see an 8-bit Super Luigi swimming; this is the level's hidden 8-bit Luigi. Later on, there is an area with two Cannons shooting Kick Bombs. Some Thwomps and a Cat Wheel appear soon after. A short path with a Goomba Tower and a Green Star follows. The road ends in a wall made of many stone Brick Blocks. The player must use some nearby Kick Bombs to break the wall, and get to the nearby Warp Box leading to the boss. After climbing up a staircase, the player encounters Bowser in the Koopa Chase.
The strategy to defeating Bowser is quite simple: the player must knock back the Kick Bombs he throws. The player will score full damage if they hit Bowser directly, but the car will take three hits before actual damage is scored. After a while, Bowser will begin to spit fire onto the road which will leave flaming residue where it lands. The player must steer clear of these fiery puddles. Once defeated, a Warp Box will appear which leads the player to the Goal Pole and the green Sprixie Princess.
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