Dotted Line Block
From the Super Mario Wiki
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Dotted Line Blocks (sometimes formatted as Dotted-Line Blocks) are transparent objects found in several Mario games such as Super Mario World, Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3, Yoshi's Island DS, New Super Mario Bros. Wii and Super Mario Run. They represent that they can be solid when a switch is triggered rather than blocks appearing from nothing. In Super Mario World, they come in four colors and turn into ! Blocks once the player hits the ! Switch in the Switch Palace of the corresponding color. In Super Mario World 2: Yoshi's Island, Yoshi's Island DS and Yoshi's New Island, after hitting a nearby ! Switch, the Dotted Line Blocks will temporarily become solid and are able to be used as platforms. Dotted Line Blocks in New Super Mario Bros. Wii become Red Switch Blocks after pressing the red ! Switch in World 3. In Super Mario Run, yellow ! Switches can change Dotted Line Blocks into Red Switch Blocks for a limited time.
Transparent boxes similar to Dotted Line Blocks appear in Super Mario 64 and its remake Super Mario 64 DS, where they turn solid and are able to be used after hitting the ! or ? Switches in the Tower of the Wing Cap (both versions), Vanish Cap Under the Moat, and Cavern of the Metal Cap (N64 version only).
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