Super Mario 64 DS/Rabbits

A Toad lost the keys to the minigames! Once you talk to that Toad in the Rec Room, rabbits will appear all over the castle grounds. These rabbits hold the minigame keys. Similar to MIPS, they'll run around when you get near them, making them hard to grab (and in Yoshi's case, stuff in his mouth). Catching them will earn you a key and the option to save. There are 28 rabbits to catch, seven for each character, and it will require all 150 stars to catch every one since you'll need the castle ground's cannon unlocked to catch one.

Yoshi's Rabbits

 * Rabbit #1: Outside the castle, at the end of the stone bridge.
 * Rabbit #2: Next to #1.
 * Rabbit #3: Next to #1 and #2.
 * Rabbit #4: Outside the castle, in a patch of yellow flowers to the right.
 * Rabbit #5: Outside the castle, in a maze of hedges to the left.
 * Rabbit #6: Outside the castle, in the moat (the water must be drained first).
 * Rabbit #7: In the basement, in front of the entrance to Lethal Lava Land.

Mario's Rabbits

 * Rabbit #1: Outside the castle, nearby the waterfall.
 * Rabbit #2: Outside the castle, in the moat (the water must be drained first).
 * Rabbit #3: In the room with the entrance to Jolly Roger Bay.
 * Rabbit #4: In the basement, in front of the entrance to Lethal Lava Land.
 * Rabbit #5: Next to #4.
 * Rabbit #6: On the second floor of the castle, in front of the entrance to Wet-Dry World.
 * Rabbit #7: In the mirror room with the entrance to Snowman's Land.

Luigi's Rabbits

 * Rabbit #1: Outside the castle, in a maze of hedges to the left.
 * Rabbit #2: In the room with the entrance to Bob-omb Battlefield.
 * Rabbit #3: In the room with the entrance to Goomboss Battle.
 * Rabbit #4: In the courtyard with the Boos, in an alcove above the door.
 * Rabbit #5: On the second floor, just to the right of the doorway.
 * Rabbit #6: In the basement, in the tunnels where you pound the two pillars.
 * Rabbit #7: On the roof of the castle (you'll need to use the cannon, but you have to get all 150 Power Stars first).

Wario's Rabbits

 * Rabbit #1: Outside the castle, nearby the trees past the wooden bridge.
 * Rabbit #2: In the room with the entrance to Whomp's Fortress.
 * Rabbit #3: In the courtyard with the Boos, behind the Star statue.
 * Rabbit #4: In the basement, in the left hall with Toad.
 * Rabbit #5: In the room with the entrances to Tiny-Huge Island.
 * Rabbit #6: At the third floor, in the room with the entrance to Tick Tock Clock.
 * Rabbit #7: Near the hole that goes to Over the Rainbow.