Blue Switch (card)
The Blue Switch is a Japan-exclusive e-Reader card for use with Super Mario Advance 4: Super Mario Bros. 3. It was released in Series 1 in Japan. It can be used in both the main game and in World-e. Its key art was orange and featured a red outline of Raccoon Mario, specifically him crouching with his tail extended.
1-Up Mushrooms turn into 3-Up Moons!