What is there even to spoil in SMG? The princess gets kidnapped and you have to rescue her from Bowser certainly doesn't count. That leaves the existence of Rosalina, I guess? Which means absolutely nothing and you meet her 10 minutes in.
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"One toot on this whistle will take you to a far away land." -Toad, SMB3
not only can games get leaked early but nintendo of america is balls as always and is releasing the game a few days later than nintendo of europe(wasn't bad enough that nintendo of america chose not to localize any of the other good games that should have come out this year, leaving the wii with a 2 year drought before the U drops)
it's amazing that americans continue to buy nintendo products.