The ol' Switcheroo

The ol' Switcheroo is an e-Reader level for Super Mario Advance 4: Super Mario Bros. 3. The level contains five Advance Coins and the star e-Coin. Its official difficulty rating is ★★★☆☆. This card was released as part of series one in Japan and series two in North America.

Level Synopsis
This level consists of several underground tunnels filled with coins. In some of these rooms, the coins float over lava, so Mario must use a P-Switch to proceed. There are also several overworld segments taking place in a desert oasis.