Teleporter (Super Mario Galaxy 2)
From the Super Mario Wiki
Teleporters are pads in Super Mario Galaxy 2 that teleport Mario or Luigi to a bonus planet where they have to defeat enemies within the time limit. Teleporters will occasionally be hidden from view and the player will have to find them. To activate a Teleporter, the player must shake the Wii Remote while standing on it. Mario or Luigi will then be teleported to a bonus area where they must defeat all the enemies (such as Goombas, Paragoombas and Piranha Plants) before they teleport back. If the player is successful at defeating the enemies, three 1-Up Mushrooms will appear for Mario or Luigi to collect before they teleport back to the main area. After exiting the bonus area, the Teleporter cannot be used again unless Mario or Luigi loses a life or returns to the galaxy after beating the level. Mario or Luigi can still use a Teleportor while riding on Yoshi. There is at least one Teleporter in every galaxy, excluding the Bowser and Bowser Jr. galaxies, Battle Belt Galaxy, and every galaxy found in World S.