Sand Spiral Galaxy is unlocked after you have fed the Hungry Luma 1000 Star Bits outside the Engine dome. The Hungry Luma will be available after you have obtained the Faster than a Speeding Penguin Power Star in Sea Slide Galaxy and the Luigi and the Haunted Mansion Power Star found in the Ghostly Galaxy.
There is only one star in this galaxy.
The goal of this level is to make it through the barrel planet with one of two power ups - the Boo Mushroom or the Bee Mushroom. To then make through the spiral platforms to reach the moon in the center, where the Power Star is located.
Magikoopas - Magikoopas will attack you by shooting fireballs at you. On this level the Magikoopa will try and teleport if you get too close and continue to be an obastacle throughout the level if not dealt with. The Magikoopa can be quickly defeated by using your spin attack or jumping on its head.
Boos - The Boos will move towards you when you aren’t facing them. You can’t spin attack or jump on them to defeat them - and if you try, you’ll get damaged.
Water Shooters - Water Shooters will shoot bubbles at you that wouldn’t normally harm you and would serve as more of a hinderance as they push you away. However, if you are Bee Mario getting hit by them instantly removes your power up and causing you to fall into the sand and lose a life.
Floating Mines - Floating mines will act as obstacles on the spiral path. They can damage you if you touch them as them will explode on impact.
Bats - Bats are going to attack you by charging at you as soon as they see Mario. They can be defeated with a spin attack.