just wait till it stops rolling or hit an object
You can't stop. It stops automatically after a few seconds or if you crash.
collect 120 stars with Mario AND Luigi, then go to the trial galaxy rock and go to the backside.
the trial galaxy rock is on top of the observatory (or around it). you have to get the three green power stars and a green launch star will appear use it to get to the trial galaxy rock.
Complete boulder bowl galaxy
There is none. It's either Boo Mario from SMG1 or Rock Mario from SMG2
Press Z or run into a wall
Walmart or game stop
Super Mario Galaxy should be for sale on April 11th 2010
super Mario galaxy 2
yes in super Mario galaxy 2 you get gobbbbleguut
Find out for yourself
Mario Galaxy 2 has been out for months.