The Ultimate Test
Grandmaster Galaxy only opens when you have gotten all 120 Normal Stars and all 120 Green Stars. It does have checkpoints but contains 4 VERY HARD sections. If you are not 100% sure of your abilities I would come into this level with 30 guys to be safe. There is nothing worse then not quite getting the last part only to know you are going to have to do the ENTIRE thing over.
SECTION ONE: Pull Flowers
The secret to this area is to keep going. If you keep going forward you will make it clear by sticking to the top path, skipping Pull Flowers as you can.
There is also a ?-Tile section with laser turrets shooting at you. Just keep pushing forward around the outside and then clean up the cross in the center. If you keep ever going forward you'll stay ahead of all the lasers.
Grandmaster - Pull Flowers
SECTION TWO: Clouds
This is actually a pretty easy section that is a large windmill cloud area. The winds constantly blows left to right and you need to ride the Cloud to safety. Keep as low as you can to avoid unneeded shocks.
Grandmaster - Clouds
SECTION THREE: Spin Floors
No fun for me. The floors are the spin variety and you have to contend with the shockwave machines. Make your jumps count because you do not have the liberty of spinning for some time. Go slow and do one jump at a time. Long jump into areas to cut down on number of needed jumps.
Grandmaster - Spin Floors
SECTION FOUR: Pull-Stars
Best advice I can give you is fall before grabbing the first Star. This drops you below. Quickly grab a Pull Star and fling yourself high above the field. Then work yourself quickly across the field above all the obstacles. If you feel yourself getting low, pause until you lose your bubble and then grab a star and fling yourself back above the mess.
Grandmaster - Pull-Stars
SECTION FIVE: Hammer Time
There is no checkpoint here. You need to get to the far end and kill the three Bommerang Bros.
Is off the right side at the second to last platform. Jump out and then spin back to the solid platform.
Grandmaster - Hammer Time
The Perfect Run
Now do the whole thing over again but you only have 1 life wedge. ENJOY! Oh yeah, just one more minor detail. There are no checkpoints. ZERO. So you have to do it all in one run.