Switch Block (Mario & Wario)
From the Super Mario Wiki, the Mario encyclopedia
Switch Blocks are blocks that appear exclusively in Mario & Wario. They come in two sizes as well as two colors. The red Switch Blocks are filled in solid by default, and the blue Switch Blocks are intangible dotted lines by default. Wanda can use her magic wand on any Switch Block to swap the physical states of all the red and blue versions, which must be done for the character to traverse through certain levels.
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