Quite simply, you can't.But, if you've got Super Mario Galaxy 2, you can unlock him after you complete Yoshi Star Galaxy.In short: You can only play with him in Super Mario Galaxy's sequel.Hope that helped.
Yes you can. You have to get all the game's 120 stars then shoot yourself to the roof where Yoshi is waiting with 100 lives and a new triple jump! You can't play as him, however. He just has a message for you from the "Super Mario 64 Team".
well super Mario galaxy 1 doesnt have Yoshi and super Mario galaxy 2 does.super Mario galaxy 2 has an icon for rossalina when you get 240 stars. super Mario galaxy 2 has coment medals which you get in the gane in all the galaxys super Mario galxy 1 you can play as Mario and lugi but in order to play as lugi you have to get 120 stars as Mario and in super Mario galaxy 2 you can play as luigi after you beat tall trunk galaky.
Yes Mario can become a boo in the game super Mario galaxy. When you get a boo mushroom.
you can not play as Yoshi in new super Mario bros DS
You can but it doesn't matter if you play Super Mario galaxy 2 before Super Mario galaxy
you can not.Only in new super Mario bros wii you can ride Yoshi but you can't play as him
I bet its super fun you get to feed hungery lummus. Fly to awsome galaxys ride on Yoshi's back.Jump swim run fly with Yoshi. Play with player 2 bounce on dangeres ememes infenedy times better then super Mario galaxy so buy it now.
You cannot play as Yoshi. On the Wii I believe that you can play as Yoshi.
No you can't play as Princess Daisy in Super Mario Galaxy, but you can play as Rosalina & Luigi.
you can meet toads in super Mario galaxy. but you cant play as one.
You can't.