By winning the first game.
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you unlock mini games but defeating other dances example: Elvira
All i know is that the mini mushrooms are in world 2 boss castle(to unlock world4) and world 5 boss castle(to unlock world 7) you have to beat the worlds 2 &7 boss when your mini Mario, in order to unlock worlds 4 & 7, it will be a little difficult beating the bosses when your mini Mario but it's worth it
First, u get mini Mario the go to World 2 and beat the boss with mini Mario. It will unlock World 4.
defeat the boss from world 2 and 5 with mini Mario
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.