World 2-3 (New Super Mario Bros.)
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The level begins in a desert with a Warp Pipe. When Mario enters through the pipe, he enters the sewers, and slides into several Koopa Troopas before reaching the bottom. On some platforms, Mario will have to Ground Pound in order to pass through them. Flippers also appear, and will open when Mario collides with them in the direction the arrow on them is facing. After Mario crosses a Flipper at the bottom near the beginning will lead the player to a Coin Block. After ground pounding and crossing the area, Mario will have to solve a small puzzle to collect the first Star Coins, located above a Piranha Plant, and also to go to the next part of the level.
After crossing the puzzle, Mario will cross the checkpoint and then he will have to slide in order to proceed. In the left corner, he can find a ? Block with a coin inside, and to the left of the block is a Hidden Block containing a 1-Up Mushroom inside it. The player will not be able to reach the big platform to the right, because they need to press a ? Switch first. Pressing the switch will cause the water level go up in order to reach the platform, or the secret exit that is located at the top. If the player goes to the level's normal exit, the player will find a Super Piranha Plant. After passing the Super Piranha Plant the player can go to the right path, where Mario can find two ? Blocks, one with a coin inside and the other with a power-up inside. The top path of the level contains a puzzle, where the third Star Coin can be found to the left. Mario can find the normal exit to the right, but before he can reach it, Mario should press a ! Switch to active some blocks in order to reach the exit. The player can use the Trampoline at the end of the level to get a 1-Up Mushroom at the top of the Goal Pole.
When the player hits the ? 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, which 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 to the secret exit and access to World 2-A.