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.
Find out how to get the Grand Finale Galaxy in Super Mario Galaxy below!
How To Get The Grand Finale Galaxy
The Grand Finale Galaxy can be unlocked by beating the game with Luigi with 120 stars.
You'll then have to talk to the Luma and say you want to go to the Grand Finale Galaxy.
Peach's Castle will be back at Kingdom as you have defeated Bowser three times.
The Grand Finale Galaxy will be your opportunity to get the 121st and final star.
You can do so by collecting 100 Purple Coins.
when you've got 99 out of 100 Purple Coins, the last one will be on top of the Starshroom ship.
Backflip to get up there and collect the last Coin.
Get the Star at Peach's Castle to finish the game.
Now you'll be able to play any galaxy you want, any dome you want, by just getting all silver stars.