Super Mario 3D All-Stars was announced September 3rd.
It's a compilation of Super Mario 64, Super Mario Sunshine and Super Mario Galaxy.
You'll be able to play it on the Nintendo Switch.
Here's how to find the hidden star in Cataquack To The Skies in Super Mario Galaxy!
Cataquack To The Skies Secret Star
A hidden star can be found in the second Gold Leaf Galaxy's star mission.
Begin by bouncing off of the Cataquack up the path.
Then go into the Sling Star, this will take you to the other half of the level.
Look for a bubble machine, it should be behind the tree.
Get inside a bubble and float to find a bell.
Ring the bell and some music notes will appear.
Collect them quickly as they will vanish.
Don't stress they take a while to disappear.
Once you've done this the star will reveal itself!