Sugu ni mantan! Power Meter!!
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The Cyan Switch is an e-Reader card for use with Super Mario Advance 4: Super Mario Bros. 3
. It was only available in Japan, so unfortunately, only Japanese players will be able to obtain it.
Once scanned, the P-Meter is halved, making it much easier to run and fly throughout stages. This opens up many new areas you can use to fly across the stage.