Bowser's Bullet Bill Brigade
From the Super Mario Wiki
Bowser's Bullet Bill Brigade, or World 2-Tank, is the second castle level of Super Mario 3D World, the first autoscrolling level and the final level of World 2. It is unlocked via completing Double Cherry Pass, and its own completion frees the yellow Sprixie Princess who builds a Clear Pipe to World 3.
The level starts with the player near some Blocksteppers and a Tank, with a ? Block on top of it. The second tank features some Bullet Bills, Crates, and Coins with some Blocksteppers following. The third has a Cannon Box and a Red Ring. After passing some Fire Piranha Plants, another barrage of tanks and Blocksteppers appear. The final tank appears with a pipe on it. The pipe leads the player to the boss of World 2, Boom Boom. After defeating him, a circle of coins and a Warp Box appear. The box leads the player to a + Clock, a Goal Pole and a yellow Sprixie Princess.
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