Ghostly Galaxy

Luigi And The Haunted Mansion

Looks like it's time to get Booed up. Make your way into the mansion here, then flip the switch by the door to turn on the lights. Lure the Boos in the room into the light by entering it and keeping your back to them; one of them will drop the key that'll let you move on. Move into the next room and collect the launch star pieces to move on.

Stern Mario helps those who help themselves.

When you reach Luigi, lock yourself into one of the pullstars, then drop down to grab the key, but be sure to lock onto a pullstar just as you fall so that you don't die. You'll find a Boo Suit inside; it will let you levitate by tapping the A button (use this ability to get the 1-Up here) and float through bars if you shake your remote.

Head into the next room and float through the bars near Luigi, then use the light to turn off your Boo suit and hop over to him. He'll give you a Power Star. When you return to the Observatory, Luigi will be at the Garage, helpfully telling you which galaxies have stars that you've missed.

A Very Spooky Sprint

Make your way through the pullstars until you reach the helmeted ghost, who will challenge you to a pullstar race. Make your way through the track as quickly as you can! Note that there is a shortcut; there's a launch star that you should see in one of the turns. Get to it and spin to launch yourself forward, but be sure to lock onto the pullstar that you land near, or you'll fall a long way back down to the ground. When you reach the far planet, the ghost will hand over a Power Star.

Beware of Bouldergeist

Make your way past the spiders here and into the mansion. When you get close to the bomb boo portrait, it'll pop out and come your way. Lure it to the fireplace and spin it to the explode and move on.

After killing the spiders, start somersaulting yourself into the sling pods and moving up. Eventually you'll use a launch star to get to another vertical area. Recreate the pullstars, then zoom over and start launching yourself along. When you see a Luma Shop, buy the red shield.

Bouldergeist: Bouldergeist's first form is pretty easy; repeatedly hit him with the boo bombs to knock off his shell and then his little dangling uvula when he floats around.

Oh, Bouldergeist. Our love could never be.

The second phase is much more difficult, as Bouldergeist will add a pair of hands to the equation. You need to avoid the punches and the various other attacks that come your way here (which can be difficult, no lie). Every so often Boulder will raise spikes from the ground; you can coax him into destroying them by standing in the middle of them and waiting for his hands to smash them. Still, the same concept applies here: you need to grab the Boos that come from the stones and chuck them into Bouldergeist's body. You'll probably have to destroy one of the hands first, though.

Look for the yellow stones here; they'll drop coins that you can use to heal yourself. When Bouldergeist dies, another galaxy gets cleared off the map.

Bouy Base Galaxy

The Floating Fortress

Dive into the water here and head all the way to the ground. There's a couple of bullet bill shooters down here. Destroy both the cages here; one leads to a pipe and the other will raise the fortress up so you can reach the top.

A green star? It's unnatural and must be destroyed!

After raising the fortress' platforms, start walljumping upwards. After spinning down the green gear, a spinning enemy will appear. Jump atop him to reach the blue screw above you and spin it down. You need to collect the five blue pullstar pieces from the rotating gears (the final one is on top of the fortress itself) to reveal the pullstar leading to the upper planet here. Make your way to the top of that planet and unscrew the golden screw to reveal the Power Star.

Bowser Jr.'s Airship Armada

Sinking The Airships

Things can get a little…hectic.

When you do reach Bowser Jr., the match becomes a boss fight. In order to defeat him, you need to bop the Koopas, grab their shells, and throw them at the ship that Bowser is piloting. It's easy enough to do early on, but later in the match the ship turns sideways, forcing you to make a slightly tougher shot, not to mention dodge the six Bullet Bills that will be coming your way. The best thing to do here seems to be to somersault over the Bills or otherwise cause them to be led astray; there's a gap between firing, so you should have enough time to grab a shell and launch it before the next group comes. Otherwise, you can just stand at the edge of the ship and let the Bills hit you; there's a fair amount of coins around, and the immunity will last long enough for you to send a shell back at Bowser.