Tons of 1-ups
If you've unlocked the Garden dome, and have Deep Dark Galaxy, go to the first mission. Here's a list of all possible 1-ups.
1) Jump your way on top of the Starshroom at the beginning. A 1-up is at the top.
2) Attack the blue crab by spinning into the front of it, then go around and hit his back. A 1-up will appear.
3) Jump into the water, and get the shell, and swim to the left side of the lake (left when facing the lake from the metal bars at the entrance of the cave). Throw the shell at the chest, and a 1-up will come out.
4) Attack all the enemies on the beach, and you'll get tons of Star bits. Get more and more, and every 50 star bits, you get a 1-up.
5) Take the cannon, and aim yourself at whichever planet you want. Read below before firing.
5a) If you shoot yourself at the brown planet, aim first at the Rainbow Star. You'll become Rainbow Mario! Run around on the planet into the pink enemies, and you'll get tons of Star bits. It would help if someone was the second player, so they could get the Star bits before they disappear. Destroy all of them. Then, take the sling star to the beach.
5b) If you shoot yourself at the Earth-like planet, kill the Goombas, then unscrew the yellow nail. The planet will start shrinking, so quickly move towards the other side of the planet, but stop in the middle. Collect all 50 coins, and you get a 1-up.
I think that's it! That's a lot of 1-ups there! Hope it helps!
If you need more help, we've got more Super Mario Galaxy cheats and also check out all of the answers for this game
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