E-Coin

e-Coins are a rare type of coins found only in World-e of Super Mario Advance 4: Super Mario Bros. 3. Fairly well hidden, only three of the eleven levels released outside of Japan have e-Coins.

Little is known about the e-Coins, except that each one is unique and features a different image on one side; the other side of each e-Coin shows the e-Reader "e". Each e-Coin can only be collected once by Mario or Luigi before going on display in the World-e Castle, where they reside in individual frames with their level of origin underneath.

There are eight frames and eight e-Coins, but they appear to serve no purpose other than bragging rights; this said, visiting the castle reveals a small display in the top-left corner reading "1F".

e-Coins and Levels
Note: Only the first three coins are in levels that were released in America.
 * Mushroom e-Coin: Vegetable Volley
 * Super Leaf e-Coin: Doors o' Plenty
 * Starman e-Coin: The ol' Switcheroo
 * Toad e-Coin: Chill Cavern
 * Mario e-Coin: Clear Skies
 * Princess Peach e-Coin: Hammer Bro. Ship
 * Luigi e-Coin: Ropeland
 * Fire Flower e-Coin: Pipe Maze