World 6-1 (New Super Mario Bros.)

 is the first level of World 6 in New Super Mario Bros. It introduces Bill Blaster Turrets.

Layout
This level is filled with Bullet Bills. When Mario reaches a thin floor, he can either hang onto it or walk on it. When Mario is on the thin floor, it is hard for him to jump. If Mario Wall Jumps on the wall after the thin floor, he will get the first Star Coin. After the checkpoint, Mario should jump to the left to get the second Star Coin. Below another thin floor, after many Bullet Bills, is the final Star Coin. After the third Star Coin, Mario will reach the Flagpole.

Star Coins

 * Star Coin 1: After the third Bill Blaster Turret, go on the next platform (on the right of the hole, followed by the trail of coins), then wall kick.
 * Star Coin 2: Before the checkpoint, instead of going right, go left.
 * Star Coin 3: Before the flagpole, take the lower route and go on a thin floor (the second) and hang on it.

Enemies

 * Bullet Bills
 * Koopa Paratroopa
 * Micro Goombas