World 2-3 (New Super Mario Bros.)

World 2-3 is the third level of World 2 in New Super Mario Bros.

Layout
The level begins in a desert, then Mario or Luigi enters through a pipe and the level continues inside the sewers, where the Mario Bros. enter by sliding. In some platforms, Mario or Luigi will have to Ground Pound to pass through them, also, there are "blocks" which are sensible when Mario or Luigi collides with them depending of which direction is the arrow. Crossing one of these blocks with the arrow in the bottom at the beginning will lead the player to a Brick Block with multiple Coins inside. After ground-pounding and crossing this part, the Mario Bros. will have to solve a small puzzle to take one of the Star Coins, located above a Piranha Plant and also go to the next part of the level.

After crossing the puzzle, Mario or Luigi will cross the midway point and then they'll have to slide in order to proceed. In the left corner, they can find a ? Block with a coin inside and in the left of this block there's an invisible block with an 1-Up Mushroom inside it. The player can't reach the big platform of the right because the player first needs to press the ? Switch to proceed and pressing it will make the water level go up in order to reach it, or the secret exit that is located in the top. If the player goes to the level's normal exit, the player will find a Giant Piranha Plant. After passing the Giant Piranha Plant the player can go to the right down path where the Mario Bros. can find two ? Blocks, one with a coin inside and the other with a Mushroom/Fire Flower inside and the top path where the level continues with another puzzle that in its left side contains the last Star Coin and to the right the player will find the level's exit, but before reach it the player needs to press a ! Switch to active some blocks in order to he finally reach the level's exit. The player can get the Trampoline at the end of the level to get an 1-Up if the player reaches the Flagpole's top.

Secret Exit
When the player hits the orange switch, they will need to swim upwards into another room filled with Coins and Dash Coins. They will need to hit another switch, which will raise the water level once more. This will last for only a short period of time, as the water level will go back down once it reaches the top. Taking the exit to the right will lead Mario or Luigi to a secret exit and access to World 2-A.

Star Coins

 * The first Star Coin is located in the very beginning of the sewers, towards the right; the player will have to Wall Jump to reach a platform where it is located.
 * The second one the player can access two ways: The first way is to defeat the Big Piranha Plant - this can only be done if the player has Fire Mario or Fire Luigi. The second way to do it is to go to the right, jump, go to the left, jump, follow right, go down, and then fall on the small platform under the top platform to get it.
 * The last Star Coin can be found in the level's last maze, where the player has go to the left side and after jumping of a small brick bridge, the player has to follow the right path in order to get it.

Enemies

 * Piranha Plant
 * Koopa Troopa
 * Swooper
 * Big Piranha Plant

Trivia

 * World 6-3 from New Super Mario Bros. Wii is completely based off of this level.