Switch Block (Super Mario 3D World)
From the Super Mario Wiki
Switch Blocks are a type of block similar in appearance to ! Blocks from previous games, appearing in Super Mario 3D World. Similar to the ON/OFF Switches in Super Mario World, Switch Blocks, when hit, change from red to blue, and usually change the direction of Switchboard tracks in stages they appear in. Switch Blocks appear in three stages: Switchboard Falls, Cosmic Cannon Cluster, and Honeycomb Starway. The one in Honeycomb Starway reveals a platform when hit.
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