How to Unlock All the Characters in Super Mario 64 DS

Here are some tips on how to unlock all the characters in SM64DS. Contrary to what you may have heard Waluigi is NOT a playable character.

Steps

1
To unlock Mario, play as Yoshi and try to unlock at least 8 stars, if some stars are difficult to earn, such as "Mario Wings To The Sky", skip them and move on to other levels.
2
Once you get 8 stars, go to the upper-right corner and enter the door there. You will see 5 doors, a white door, a red door, a green door, a yellow door, and a plain door.

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3
Open the plain door, and enter the room. Go to the upper-right corner in the polka-dotted room. Open the door that's there, jump into the portrait of Mario, head left and stop at the spot where you see poison in front of you. Then go left as it's a shortcut.
4
Stop when you see logs in front of you.
5
Jump on top of all 3 logs, if successful, go the pass with the Piranha Plant and climb up the vine.
6
Climb up the bridge once you reach the top of the platform. Be alert though, there are Goombas on the bridge they can only be stomped while they are on the bridge, but once you get close to the end of the bridge it is possible to swallow them.
7
When you've reached the end, if Yoshi doesn't have full health, touch the spinning heart.
8
After healing Yoshi, fall into the hole that is on the last log.
9
Defeat the level boss you meet here.