Cosmic Cannon Cluster
From the Super Mario Wiki
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Cosmic Cannon Cluster, or World Star-9, is the ninth and final standard level of World Star in Super Mario 3D World. It is unlocked by completing Peepa's Fog Bog, and its own completion unlocks World Mushroom and Night Falls on Really Rolling Hills. Likewise, 210 Green Stars are required to unlock this level.
The level contains many various challenges, ranging from using a Cannon Box to hit a switch on a moving Switchboard to dodging cannonballs underwater. The characters start by going on a switchboard around several Parabones. Then they climb a wall by jumping on the cannonballs, and go through an underwater tunnel. After the Checkpoint Flag, there is a network full of Switchboards, Parabones, and Switch Block. All that remains is to get to the Goal Pole.
While riding the first switchboard, players can either find a Cannon Box and hit the ? Blocks to reveal a hidden bridge to the Stamp or find a Cannon Box by the first Green Star and backtrack with the switchboard.
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