New Super Mario Bros./World 7

To get to this world you need to beat the boss of World 5-Castle as Mini Mario.

World 7-1
The secret to the second Star Coin is to ride a certain flying ? block to the right instead of taking the 1-Up Mushroom from that block. The block will take you to an area with the Star Coin, many coins, and another 1-Up Mushroom! The bad thing is that when you exit the area, you will have missed the checkpoint, thus to keep your Star Coin you will need to clear the course without dieing.

The rest of the World 7 Level guides are coming soon.