World 5-C

World 5-C is the third and final secret level in World 5 of New Super Mario Bros. The level is unlocked by clearing World 5-B, and clearing this level leads to World 5-4.

Layout
This underground level contains Buzzy Beetles and Broozers. Mario must let a Broozer break some blocks to get the first Star Coin. After avoiding a few falling Buzzy Beetles, Mario should grab one of their shells and throw it at the second Star Coin, found past a moving platform. To get the third Star Coin (and an easier way to the flagpole), Mario must, after the midway point, see a row of four bricks with a longer row above it. He should jump on the bricks, hitting a Brick Block above the one on the far right. Then he should hit the brick he's standing on (the far right) to reveal a Beanstalk. The player should climb it to a secret area with a Broozer. Mario should hit the P Switch and let the Broozer punch his way through some blocks to get the third Star Coin. After he goes through the narrow hole, Mario will be at the flagpole.

Star Coins

 * Star Coin 1 - Mario should have the second Broozer destroy the columns of block blocking Mario from getting it. Mario should not defeat the Broozer, but instead should have it follow him to the newly opened pathway. He should hop on top of the big block formation surrounding a Star Coin, then have the Broozer destroy the bottom rows of the blocks, revealing an opening to the first Star Coin.
 * Star Coin 2 - Right before the midway point, Mario should go the area with the moving platforms going downward. He should then stomp on the Buzzy Beetle, carry it to the right of the area and throw it to obtain the Star Coin.
 * Star Coin 3 - After the midway point there should be a row of four Brick Blocks with a row of more Brick Blocks above it. Mario should hop on top of the lower layer of blocks and destroy the blocks above them. Mario must then go back down and hit the block to the far right to reveal a Beanstalk. He should climb it and hit the P Switch to turn the coins into blocks and vice versa. Mario should then get the Broozer to follow him and have it break the blocks covering the last Star Coin. (pictured)