Super Mario 3D World's Cosmic Cannon Cluster level is home to three Green Stars and one Stamp, and players that are going for 100% completion will need to collect them all. Fortunately, that is not extremely difficult to do, though some of these collectibles can be slightly tricky to locate. For those fans that may be having some trouble finding any of the Green Stars or the Stamp in Super Mario 3D World's World Star-9, this guide is here to help.
The first Green Star in this Super Mario 3D World level can be found near its start, just after the vertical stack of cannons that is used to scale a wall. More specifically, players should head to the right when they reach the platform at the top of that stack, and then shoot a cannonball at the cracked wall to reveal the Star. Notably, fans can get a Cannon Box from one of the Question Mark Blocks near the base of the cannon stack.
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After collecting Green Star #1, Super Mario 3D World players should hold onto the Cannon Box powerup and make their way to the level's underwater section. They should then fire cannonballs at the Brick Blocks that are on the side of the first black and orange structure. Destroying those blocks will allow fans to enter the structure, and they will find the second Green Star when inside.
The final Green Star is found after the level's checkpoint, and players will again need to have the Cannon Box powerup in Super Mario 3D World to access it. While riding the Switchboard, fans should shoot a cannonball at the second switch in order to guide the track toward the Star. Then when the Switchboard is in line with the collectible, players should fire a second shot to obtain it, taking care not to go off the edge of the track.
This Stamp in Super Mario 3D World is all the way back at the beginning of Cosmic Cannon Cluster, and it also can only be collected with the help of the Cannon Box. Such a powerup is hidden within a Question Mark Block that can be accessed while riding the first Switchboard, and players should fire at the four Question Mark Blocks near the platform with the Stamp. This action will cause an extended platform to appear, which fans can cross to grab the collectible.
Super Mario 3D World + Bowser's Fury is out now, exclusively on the Nintendo Switch.