Bowser Jr.'s Boomsday Machine
In front of the captain of the search party, Bullet Bills are shot. You have to fly one of them behind you and destroy the glass ball. Above all, take care of the mud, which slows you down significantly and you can no longer avoid. Finally jump into the cannon and head towards the target to collect an extra life. Then bring the two Hammer brothers down to make a Launch Star appear.
Touch the Checkpoint Flag and jump into the cannon. Catapult yourself with her to the next target and make sure that you do not catch any of the floating sting rocks. On the next planet, you jump from platform to platform towards the center. You can also find the Comet Medal of this galaxy. Destroy the round stones with a ground pound and use the Launch Star, which shoots you directly to the final battle against Bowser Jr.
Boss Fight: Bowser Jr.
Collect a cloud flower at the beginning and let yourself drift up in one of the air drafts. Then you reach another cloud. From here you can jump to the glass cockpit by long jump. On the way you have to make a cloud, because the way is too far. Ultimately executes a ground pound.
Now you have to repeat the whole thing twice. However, the whole thing is made a good portion difficult. You must constantly avoid the flames on the ground and the electric balls that also destroy your cloud as soon as they hit it. You need a lot of staying power to make it back to the cockpit. If you have the bow out, that should not be a problem.
Boomsday Machine Daredevil Run
Select this challenge when the Prankster Comet appears.
With this comet star, you have to successfully complete the entire level including the final battle with only one health, which is quite tricky. While the beginning remains the same, the planet with the moving red and blue platforms was exchanged for a purple swamp. Here you have to hit the target and then jump on the platform to go. Move back and forth so that you do not come into contact with the purple mass. With the Cloud Flower you finally reach the Launch Star to the final battle, which is correspondingly difficult to master.
Comet Medal
On the spinning-platform planet, reach the second ring of platforms. The medal is between two Space Mines. Use the Cloud Flower to stabilise the approach and avoid the mines.
Green Stars — unlock requirement
Collect all 120 regular stars and defeat Bowser again to unlock the Green Star hunt. Choose the corresponding Green Star mission from this galaxy’s mission screen. Follow the detours below rather than collecting the normal mission’s ending star.
Green Star 1
On Megahammer Planet, break the cage to enter the cannon. Aim above the target at the visible green star and fire directly through it instead of taking the usual landing shot.
Green Star 2
Enter the cannon on Cannon Planet. Move the aim far left of the normal route until the star is centred, then fire at it. The cannon flight itself collects the star.
Check each numbered Green Star on the mission screen after collecting it. The routes finish immediately when the star is touched, including stars suspended over a gap.