More:Super Mario Galaxy: Locations
From GameWinners
Battlerock Galaxy: Garbage dump star
You will be told where to place the bombs for the most effective blast patterns. Place a bomb on each yellow circle (the ones you shoot to make a coin). They will blow up all the garbage.
Buoy Base Galaxy: Pokemon reference
In Buoy Base Galaxy, above the tower where you collected the Blue Star Pieces, is a little planetoid that is a sphere with two red panels on top and a lighter bottom with a screw in the middle. It looks exactly like a Pokeball.
Comet Observatory: Extra lives
At the Comet Observatory, run around and collect the 1-Up Mushrooms. Go into a Dome and come back out. All the 1-Up Mushrooms will have respawned. Note: More 1-Up Mushrooms can be gotten after you unlock the Red Star.
At the observatory, there are five 1-Up mushrooms. One is behind the base of the kitchen. One is in the box at the garage. There is another under the library and bedroom (only one mushroom here, not two). The fourth and fifth require the Red Star. One is under the gateway. The last one is at the very top of the observatory.
Deep Dark Galaxy: Shortcut
In the Deep Dark Galaxy level you can use the cannon on the beach for a shortcut. Normally you would need to use the cannon to shoot yourself to the nearby planet to get a Fire Flower then use the Jump Star to return to the beach so that you can light the two torches to open the door in the first star, or the three torches to make the Ice Flower appear in the second star. However if you get in the cannon and turn it all the way to the left as far as it will go, you will see two yellow platforms moving up and down. Watch them carefully. When the farthest platform is up, line your crosshairs up with the side of it. Then, wait until the closest platform goes back up and fire yourself in that direction. If timed correctly, the platforms will have switched again and you will hit the side of the furthest platform and fall on the ground. You must hit the wall or you will overshoot and die. This will put you inside the "bowel" area without opening the door on the first star. If you are on the second star you will not have to worry about getting the Ice Flower to cross the lake and jump the faucets. You can just proceed right and climb the poles to get to the Bubble Shooter.
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Dreadnought Galaxy: Garbage Dump star
This star is difficult to get because the bombs do not seem to explode fast enough. First, place a bomb on all of the little yellow circles that you shoot to make a coin. This will provide the best blast coverage, so you will need six bombs. When the level starts, long jump the left-most bomb. Take it, run forward a bit, and throw it at the furthest left side yellow dot. Next, long jump back to the second bomb (from the left) and take that bomb. Turn around and throw it. The bomb should land just about on the left side middle dot. Get the third bomb and do the same thing. It should land just about on the right side middle dot. Next, take the fourth bomb and run forward a bit. Throw it at the furthest right side dot. Long jump back to the first bomb again. It should be just barely shooting out another bomb. Take it and throw it at the closest left side dot. Finally, get the second bomb (from the left) and toss it at the closest right side dot. When you pick up that last bomb you should have about fourteen seconds remaining on the clock, and must have at least eleven seconds. It is important to take the second bomb for the closest right side dot because it lights when you pick it up. The bomb will already be active while you run to the dot. It is also important to get the bombs as close to the yellow dots as possible and execute all your moves flawlessly (no unnecessary jumps or spins) as every second counts. This will require some practice. You must experiment with how far Mario can throw the bombs. For the left and right furthest dots, try throwing them when you are even with the closest dots.
Honeyhive Galaxy: Defeating Cosmic Mario
Hold Forward before the race begins. Press Z to crouch when the timer reaches "2", then immediately press A when the race begins. If done correctly, Mario will turn yellow briefly and get a quicker start.
When racing against Cosmic Mario, perform long jumps to reach the goal quicker.
Rolling Gizmo Galaxy: Easy star bits
Go to Rolling Gizmo Galaxy with either Mario or Luigi and get plenty of 1-Ups. Then, collect every star bit you can find. This may require some time, but you can get 999 star bits easily without "galaxy hopping".
Sling Pod Galaxy: Easy star bits
There is a comet where there are a lot of star bits. Grab onto the nearest grey tree and collect all the star bits. You will get an extra life because of the number of star bits. Once you have collected all of the star bits, intentionally fall into the black hole. You will not lose a life because of the previously awarded extra life. After you have jumped into the black hole you will respawn at the last grey tree you were on. Collect all the star bit again and jump off. Continue doing this to get as many star bits as desired. Each time will result in about fifty star bits.
Space Junk Galaxy: Extra lives
In Space Junk Galaxy, select the Tarantox's Tangled Web star. Play through the level until you get to the glass-covered planet. If you have not already done so, feed the Hungry Luma fifty Starbits. Use the Launch Star it creates to go to the Yoshi head planet. Now, without killing them, collect as many Goombas as possible and get them to follow you. You will need at least eight of them. Jump and keep bouncing on them without hitting the ground. A number should appear that counts up to "7". On the eighth Goomba you will start getting extra lives for every Goomba you bounce on. It is possible to get more than ten extra lives per attempt.
Space Junk Galaxy: Pikmin reference
One of the planets is shaped like Captain Olimar's rocket ship that appeared in Pikmin and Pikmin 2.
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