World 6-B is the second bonus level of World 6 in New Super Mario Bros.. It is unlocked after completing World 6-Fortress 2 and through using five Star Coins. Completing this level will unlock World 6-6.
The player starts on ground, with a few Warp Pipes to the right. Mario must enter the pipe on the far right, which will blast him upwards to where he will then grab several ropes, and successfully swing to the next platform. After several ropes, the player can find the first Star Coin floating over an abyss. In order to obtain it, the player must jump on a Koopa Troopa and grab its shell to throw it at the coin. Soon afterwards, the player will find several purple tilting mushroom platforms that they will need to traverse past, as they approach another Pipe Cannon that will launch them upwards to reach the checkpoint. The player will find the second Star Coin to their left, which can be obtained by jumping off a Koopa Paratroopa. After jumps over Piranha Plants and sliding down tilting mushrooms, the player can choose to take an upper or lower route, before approaching several pipes. All pipes will launch Mario forward, but each one will launch him at a different angle. After swinging across more ropes, the player can take a lower or upper route, in which there will be a Star Coin on the upper route. After more jumps across pipes, the player will reach the Goal Pole.
- Star Coin 1: The first Star Coin is located above an abyss underneath the fourth rope swing. Mario must throw a Koopa Shell at it in order to obtain it.
- Star Coin 2: The second Star Coin is located to the left of the checkpoint, where Mario is launched up by a pipe cannon. The player can jump off the Koopa Paratroopa to reach it.
- Star Coin 3: The third Star Coin is located on the upper route past three Warp Pipes and two rope swings. Mario must duck and slide to reach it.
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