The ol' Switcheroo
From the Super Mario Wiki
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 Super 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. Both the English and Japanese key arts for the card depict Ludwig von Koopa on the card.
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 Switch Block to proceed. There are also several overworld segments taking place in a desert oasis.
Names in other languages