World 3-B (New Super Mario Bros.)

World 3-B is the second secret level of World 3 in New Super Mario Bros. The level is accessed by locating the secret exit in World 3-2, and completing the level leads to World 3-C.

Layout
This level is entirely made up of pipes. Many of them are inhabited by Piranha Plants and Fire Piranha Plants. To begin, Mario just needs to go and jump over the pipes, while avoiding the Piranha Plant's fireballs. The first Star Coin is obtained by going into a Red Pipe about halfway through the level, then going through another Red Pipe. Mario then must keep jumping onto more pipes, avoiding all the Piranha Plants. To get the second Star Coin, Mario should Wall Jump between the Red and Green Pipe near the Star coin, going over the Red Pipe. The last Star Coin is obtained easily, just by going past a Piranha Plant. After the Star Coin is the Flagpole.

Star Coins

 * Star Coin 1 - After venturing through some of the level, there should be a lone red pipe. Enter it and then go all the way to the left. Enter the red pipe in the far left and the plumber will be taken to the Star Coin.
 * Star Coin 2 - Wall Jump next to the star to go over the red pipe. Get the coin and fall through the small opening in the right side.
 * Star Coin 3 - Just run past or kill the Piranha Plant in the way of the Star Coin.

Enemies

 * Piranha Plant
 * Fire Piranha Plant