In world 7-a there is a questions mark after the half-way point that always contains a mini-mushroom. If you get it and turn into min-mario you can easily leave the level as mini-Mario and start out wherever you need to be a mini. Not as good as having a mini in reserve, but a gaureented way to find one. Also, inside the mushroom houses if you already are mini-Mario it increases your odds that the random question mark will give you another mini-Mario...then you will be mini Mario and have one in reserve. If you have already defeated the game and can save...once you are mini-mario, Go to the entrance of whatever level you need to be mini-Mario in, save the game and then if you get killed, you can POWER off the game after you die and then you will start back right at the entrance with all your lives and reserves intact and you will still be mini and won't have to go back through all the hassle of playing level 7-a or finding another mini again. Simpley power off and then back on as much as you need until you have used the mini to retreive whatever prize you are working on.
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First, u get mini Mario the go to World 2 and beat the boss with mini Mario. It will unlock World 4.
You first get him at 1-3 mini mushroom!?!?
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.
You need to defeat Petey Pirhanna as mini Mario or mini Luigi.
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