World 4-3 (New Super Mario Bros.)

World 4-3 is the third level of World 4.

Layout
This level takes place underwater. Go into the pipe and start swimming. Soon, the level will start auto-scrolling. Maneuver through the water while avoiding the Regular and Mega Unagi. The first Star Coin is in a little crevace about a quarter into the level. After the coin is a Red Coin Ring. The second Star Coin is found about halfway into the level between two Unagi. If the player presses the ? Switch and then goes into the green pipe that is next to the yellow pipe, they will find the final Star Coin. After going through the Exit Pipe, Mario will reach the Flagpole.

Star Coins

 * Star Coin 1 - After the first Mega Unagi passes, swim to the right and go under a rock formation to get the first Coin. Speed is vital because if the player is not fast enough, Mario will be crushed by the scrolling screen and rock.
 * Star Coin 2 - This Coin is located at the bottom of the level, but is guarded by two Unagis.
 * Star Coin 3 - After hitting the ? Switch swim, enter the lower right green pipe to be transported to an area with two Unagis and a red pipe spewing bubbles. Swim over the cave of the Unagis and use the bubbles to get the Coin.

Enemies

 * Goomba
 * Cheep-Cheep
 * Unagi
 * Mega Unagi