Super Mario Galaxy - Grand Finale Galaxy (Star 121)
(Taken from Stream Footage from 6th February 2021) After getting 120 stars as both Mario and Luigi (on the same file) you unlock this final star. You need to go into the Trial Galaxies (Green Stars) to find it. That wasn't obvious to me as I had other ideas on how and where you play the level from.
Super Mario Galaxy - https://www.youtube.com/playlist?list=PL7_1kJaJRpTGno1_XhYCkQdiSczi4l1Yo
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Super Mario Galaxy Statistics For TheJDSgames
There are 5,810 views in 36 videos for Super Mario Galaxy. About 16 hours worth of Super Mario Galaxy videos were uploaded to his channel, roughly 3.84% of the content that TheJDSgames has uploaded to YouTube.