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The Red Switch is an e-Reader card which is used with the game Super Mario Advance 4: Super Mario Bros. 3. It is only available in Japan.

Once this card is scanned on the e-Reader, it replaces all the enemies with more difficult ones. However, the points that the player receives from defeating these enemies are doubled, making the player's score accumulate much faster.

New Super Mario Bros. Wii
It's appared in New Super Mario Bros. Wii. In this game, it transforms the Dotted Line Blocks in Red Switch Blocks