Tox Box Shuffle
From the Super Mario Wiki
Tox Box Shuffle is one of Yoshi's minigames in Super Mario 64 DS. It involves three Tox Boxes, one of them trapping Yoshi underneath itself. The Tox Box then shuffles around with its partners, making it hard for the player to tap the correct Tox Box to free Yoshi. As the game goes on, the Tox Boxes go faster, and one more Yoshi (a Light Blue Yoshi) get trapped. As both Yoshis get trapped, the player will have to get the correct Yoshi, making him or her have to keep track of all Yoshis. This Minigame features a floating Mario head. The Mario head will laugh when the player finds a Yoshi.
 In-Game Instructions
Oh no! Yoshi's trapped in a Tox Box! Find which one he's in to save him!