World 4-1 (New Super Mario Bros.)

World 4-1 is the first level of World 4 in New Super Mario Bros.. The level must be reached by using a secret exit in.

Layout
Much of the level is flooded by Poisoned Water. If Mario touches it, he will instantly lose a life. To start, Mario should keep walking until he finds some Scuttlebugs. He should jump on them to gain a jumping boost, which is used in collecting the first Star Coin. About halfway into the level, the player should see a Dorrie. Jump on it to ride it, while avoiding the Scuttlebugs. Mario does not need to ride the Dorrie as he can simply make long jumps and bounce off the Scuttlebugs and stand on blocks in between them. To get the second Star Coin, Mario again should get a jumping boost from the Scuttlebug. After getting off Dorrie, Mario should jump onto the donut lifts to avoid falling into the goop. The final Star Coin can be obtained by using a Koopa Troopa and throwing the shell at the coin. After this, Mario reaches the Flagpole.

Secret Exit
While Mario is riding Dorrie, the player should notice that on the way, there are two ? Blocks with three normal blocks in between. If Mario gets on top of them and jumps in the middle, a Beanstalk will appear. Climb on it and enter the pipe to reach the Red Flagpole. The secret path opens up a Toad House and takes the player to 4-Tower.

Star Coins

 * Star Coin 1 - Jump off one of the two Scuttlebugs to reach the first Star Coin.
 * Star Coin 2 - While riding Dorrie, jump off one of the Scuttlebugs again to reach the second Star Coin, but while taking caution of the toxic water.
 * Star Coin 3 - After hopping off Dorrie, there should be two Scuttlebugs and a brown block formation. Kill both Scuttlebugs and carefully traverse the Donut Lifts and toxic water to reach the star coin.

Enemies

 * Goomba
 * Koopa Troopa
 * Scuttlebug