World 2-3 (New Super Mario Bros. 2)

This level takes place underground. The player starts on the desert ground where a Pokey can be found. Entering the yellow Warp Pipe takes the player underground. The main power up, the Super Leaf can be found in a ? Block above the first Pokey underground. After passing a few floating platforms and some Pokeys, the player will encounter a few sets of rotating platforms with several Pokeys on some of them. The player will then find the checkpoint, a Roulette Block, two Coin Roulette Blocks (each Roulette Block has two Spike Tops) and a springboard used to bounce to the Roulette Blocks high up. After passing the checkpoint, there are two platforms moving up and down with a Pokey and a yellow Warp Pipe which warps the player to the next area. There are Brick Blocks, ? Blocks and red POW Blocks in this area (see Star Coin 2), followed by platforms that go in opposite directions (two sets move downwards and one set moves upwards), two of which have Pokeys on them, and a Red Ring. After passing a few more Buzzy Beetles and crossing quicksand, a green pipe can be found to blast Mario out of the cave. Back on the surface, there are several stone platforms with Pokeys floating over a pool of quicksand. Crossing it leads to the flagpole.

Star Coins

 * Star Coin 1: Just after the checkpoint, the player should see two Warp Pipes, the lower one obstructed by Brick Blocks. A Buzzy Beetle can be found on the upper pipe. The player has to pick up the Buzzy Beetle and go to the lower moving platform (the one without the Pokey) and try to activate the outer POW Block. If successful, a path will open for the player to reach and enter the pipe. After entering the room, the player should go left and drop down the hole. There are many Piranha Plants that pop out simultaneously every few seconds. Grab the Star Coin that's on the player's left and head back right.
 * Star Coin 2: At the beginning the second area, there is a gap in between the Brick Blocks. The player needs to carry the Buzzy Beetle found further down the level to just before the gap. Releasing the shell will activate all the red POW Blocks, opening a path to the Star Coin. The player should also watch out for the Goombas.
 * Star Coin 3: When reaching the Red Ring, the player needs to climb up the third set of downward moving platforms while moving towards the right to a platform made of Brick Blocks and POW Blocks. Navigating through the path by jumping from platform to platform will bring the player to the Star Coin.

Enemies

 * Pokeys
 * Buzzy Beetles
 * Spike Tops
 * Piranha Plants
 * Goombas