When you have enough stars to open the room Mario's picture is in, go to that room & jump in the picture. In the level you'll see 2 tall tree stumps with a wooden bridge. Go to the shorter tree stump & climb to the top. Cross the bridge, & fall down the hole. Defeate Goomboss to get the key to Mario's room (the room with a "M" on the door). The room Mario's picture is in is behind the room with the mini-games & a picture of a beach.
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You cannon play multiplayer mini games in Super Mario 64 DS. Are you sure you don't mean New Super Mario Brothers? It has multiplayer mini games.
No but you can use a cheat
Only Mario but in the DS game you can play Yoshi, Mario, wario and luigi.
No,it is impossible to get Waluigi in Super Mario 64 and Super Mario 64 DS.
Boshi is not in super Mario 64 ds but rumor has it boshi might return becase the only game he was in was super Mario RPG