Timer yukkuri!

The Green Switch is an Japan-exclusive e-Reader card that is used with the game Super Mario Advance 4: Super Mario Bros. 3. It was included in the Series 2 set of cards.

Once this card gets scanned, the timer slows down for 50 counts, giving the player more time to complete the level that they are in currently. When 50 counts are past, the "coin" sound is played and the timer goes back to its original speed.