Super Mario 64 DS/Rabbits

One of the Toads has lost the keys to all the minigames! Once you talk to the Toad in the Rec. Room, the rabbits will appear all over the castle both inside and the castle grounds! These rabbits hold the minigame keys. Similar to MIPS, who appeared in the basement twice (when you have 15 and 50 power stars, respectively) in the original game, giving 2 power stars, they'll run around when you get near them, making them hard to grab (and in Yoshi's case, stuff in his mouth, which is a bit easier). Catching them will earn you a key and the option to save, instead of stars. Each character has seven color-coded rabbits to catch, for a whole total of 28 and their color and locations vary from character to character. Wario catches orange, Luigi catches green, Mario catches purple, and Yoshi catches yellow. It will require all 150 stars to catch every one since you'll need the castle ground's cannon unlocked to catch Luigi's last one. Yoshi has eight, because one is for opening keys to unlock the castle's front door, at the beginning of the game. These rabbits also appear in Super Mario 3D Land. The following table below shows the locations of all the rabbits, the minigames unlocked, and the amount of power stars required for the rabbits to appear and minigames to unlock.

Glowing Rabbits
After collecting 8 Power Stars, there will be eight glowing rabbits that will randomly appear in place of the ordinary ones that have already been caught. These rabbits have white sparkles on their body and red eyes. You can collect all of them with any character in any part of the castle, however, there is a much faster way. Switch to Yoshi and step out of the castle through the front door since six of his rabbits are out there. The seventh one can be found in the basement next to the Lethal Lava Land and Shifting Sand Land paintings. Just repeatedly enter and exit the castle to quickly summon eight glowing rabbits. The final rabbit states "It's the fastest and oldest of the family" while each rabbit then before states that they are "the second-fastest of my eight rabbits". After catching all eight, you will get the key to unlock the last white door in the character selection room, next to Wario's door, which contains a secret power star.

Trivia

 * Wario is the only character that you can catch all the rabbits with without draining the moat.