World 4 (New Super Mario Bros. Wii)

World 4 is the fourth world of the game New Super Mario Bros. Wii, and is controlled by Wendy O. Koopa. It features several tropical islands, therefore, most of its levels are water-themed and make rather good use of the Penguin Suit, which can glide over water and allow Mario to swim better. Also, on the map is a bridge guarded by a Porcu-Puffer that can jump up and make Mario and the gang endure an Enemy Course. This is also the first world to have a level on an Airship, like the ones in Super Mario Bros. 3.

This level has two choices right from the start-platforms or water. The player can clear the level by jumping on platforms or only being in the water. This level has Urchins, Mega Urchins, Cheep-Cheeps, Spiny Cheep-Cheeps, and other enemies like those.


 * Star Coin 1: This Star Coin is found near the start of the level, high above the water. The player needs to swim down and freeze the Piranha Plant underwater, using it as a platform to reach it.
 * Star Coin 2: Somewhere after the checkpoint, the player can hear a sound from a Roulette Block. The player should go into the water, move further down, and swim up to find an Urchin and the Star Coin. The player needs to freeze it and use it as a platform before it breaks free. (The Roulette Block is in a hidden aclove just left of the Star Coin)
 * Star Coin 3: Near the exit, the player should be able to see two Urchins next to a pipe with a strong water current. The player should freeze the two Urchins and use them as a platform to reach an alternate exit pipe before they break free. The Star Coin is located above this pipe.

A lot of this course is filled with Donut Blocks and Cheep-Cheeps that will jump up to attack the player. To get one of the Star Coins, Mario has to stand on a long falling platform with the Donut Blocks' coloration.


 * Star Coin 1: The Star Coin is located just above the first floating barrel in the level. Beware of the Cheep-Cheeps when Mario gets this coin.
 * Star Coin 2: After the checkpoint, it is located below a ledge. Just hang from it to get it.
 * Star Coin 3: Near the end of the level, there are two ledges which will fall like a Donut Lift when using it for too long. Do so for the first to reach the bottom ledge. Then go to the next ledge and jump to get the Star Coin.

This is the only level that features Huckit Crabs. There are also a lot of Urchins and Mega Urchins.


 * Star Coin 1: The Star Coin is located near the beginning of the level, above a ? Block above a yellow moving platform with a Huckit Crab on it.
 * Star Coin 2: This Star Coin is located above a Mega Urchin near the checkpoint (pictured). The player may either: (a) Use a Penguin Suit found in the level along with a Star found in a Brick Block earlier in the level. The player should slide quickly to get to the next island where a P-Switch is located. Pressing the P-Switch will display the path (represented by blue coins) to reach the Star Coin. (b) Use a Mini Mushroom found in one of the three Brick Blocks just before the checkpoint to leap over the Mega Urchin.
 * Star Coin 3: Obtain the Mini Mushroom as stated in part (b) above. Continue forward past three Huckit Crabs. The player should see an Urchin next to a green mini pipe. Enter it to collect the third Star Coin.

This tower features a lot of conveyor belts. Metallic blocks are also a common sight here; some must be jumped on to advance, while others are more of a nuisance. If the player isn't careful, he/she may get crushed by the blocks. Wendy O. Koopa is fought here, at the end.


 * Star Coin 1: Found in the second room, the Star Coin can be obtained by jumping from a metal block which is about to fall.
 * Star Coin 2: There is a hidden aclove containing the Star Coin just below the checkpoint. Jump from the rightmost conveyor belt to reach the coin.
 * Star Coin 3: This coin is located in the last room before the boss door. If the player is playing alone and taking the secret exit (described below), the player won't be able to get this Star Coin (unless he or she has a Propeller Suit, which will still be extremely difficult). If playing multiplayer, one player rush to the secret exit (without entering the pipe) while the other wait to get the Star Coin. The player has to wait for the last metal block from each column to drop (except the leftmost column) and then jump on it. The player should then dash to the coin and back before the last metal block drops.

Secret Exit
In the last room, there are many metal blocks which are about to drop. Dash for the left wall, leaping over the gap, as quickly as possible before getting squished and jump into a hidden aclove in the wall with a Warp Pipe. The pipe leads to the castle's rooftop which contains the secret flagpole. This exit takes the player to the world's Warp Cannon, which takes the player to World 6.

This is an underwater level. It is infested with Bloopers, Blooper Nannies and pipes that blow bubbles. In one Bonus Area, one of only two Cheep Chomps in the game can be found.


 * Star Coin 1: After the checkpoint, look for a P-Switch on the ceiling and activate it. All pipes releasing a stream of bubbles will turn off and a trial of blue coins is seen. Follow the blue coins quickly to a yellow pipe before the time runs out, otherwise the pipe will begin blowing bubbles again. Through the pipe, obtain a Penguin Suit to freeze the Cheep-Cheep at the right time and use it as a platform to reach the Star Coin.
 * Star Coin 2: The coin is located between two green pipes at the bottom of the level, near a ? Block.
 * Star Coin 3: Just before the exit pipe is a "wall" that seems to block the player's way to the exit pipe and they must go above it instead. The "wall" is actually a hidden area containing the Star Coin.

In this level, at the start, the floor moves up or down when the player stands on it (right at the beginning there is a Starman too). Enemies found here include Boos and Scaredy Rats. The player must then hit a P-Switch on the ceiling in a hidden aclove which requires standing on the floor which moves up. This enables access to the door leading to the next area. Through this door is a long area of stairways going up and done, where many clusters of Scaredy Rats run along. Past the area is the flagpole.


 * Star Coin 1: The coin is hidden in the sixth platform in the first room. Stand on the platform to reveal the Star Coin.
 * Star Coin 2: This coin is only accessible via the normal exit. Don't go through the door leading to the flagpole, instead go past it. Walk through the wall to reveal a hidden aclove containing the Star Coin.

Secret Exit
Before the door to the second area, there is a ? Block containing a coin. Stand on the platform below it to reveal a hidden door. Go to the door to the next area and continue to the flagpole. This exit unlocks World 4-Castle and a yellow Toad House.


 * Star Coin 3: This Star Coin is only accessible via this exit. In the second area, the Star Coin can be seen near the ceiling. Stand on the platform just below it to reach it.

This level is on a beach filled with Lakitus and cloud blocks (when the player hits them, they turn into Lakitus that throw coins instead of Spinies). At the beginning, and in other places around the level, the player can find a Yoshi, to make the level a bit easier. Some areas can only be reached by riding a Lakitu's cloud.


 * Star Coin 1: The coin can be seen just after the ? Block containing the Yoshi, above a green pipe with a Piranha Plant. Flutter jump from the nearest tree to get it.
 * Star Coin 2: Just before the checkpoint, there is a column of coins above a tree. Get a cloud from a Lakitu and follow the coins to the Star Coin high in the sky.
 * Star Coin 3: There is a very tall tree with a green pipe above it after the checkpoint. The player also needs a cloud to get to the tree to access the pipe. Through the pipe there are many cloud blocks. The player needs to use the clouds to reach the Star Coin.

This course features fences that can be held onto, along with some Climbing Koopas that cling onto the fences. The player can sometimes also change which side of the fences he/she can hang on from. If the player has an ice flower or a penguin suit, they can freeze the third climbing Koopa Troopa and if done in a special way, eternal coins will come out of the coin block.

Additionally, the spiked pillars that appeared in Wendy's Castle and the Valley Fortress back in Super Mario World make an appearance here. However, the are all horizontal instead of vertical.

Fishbones make their first appearance in this game here.

The player faces Wendy O. Koopa for a second time here. However, at times the water level will rise, which can make it harder for the player to stomp on her head.


 * Star Coin 1: The first coin can be seen behind a fence in the first room. The player needs to flip to the back of the fence first before obtaining the Star Coin.
 * Star Coin 2: The second coin can also be easily seen after the first Star Coin. The player has to wait for the spiked pillars to return to get the Star Coin.
 * Star Coin 3: There is a green pipe just below the boss door. Through the pipe is an underwater area containing many Fishbones, two ? Blocks and the Star Coin.

This is the first airship level in the game. The main enemies in this level are the Mecha-Koopas and the Rocket Engines. Near the end, there are Cannons and pipes that release Bob-ombs. The flames from the Rocket Engines can make them explode. The boss of the airship is Bowser Jr. in a Koopa Clown Car. The player must propel up with Propeller Blocks, or a Propeller Suit if the player is lucky enough to have one, and stomp on his head 3 times.


 * Star Coin 1: The Star Coin is located in a gap on the floor next to a Rocket Engine. Get it when the engine moves away.
 * Star Coin 2: Just after the checkpoint there are stacks of boxes blocking a green warp pipe. Ground pound the boxes to access the pipe to get to the bottom of the ship. Continuously jump on the screw to move forward and to prevent from falling off. At the end is the Star Coin.
 * Star Coin 3: Before the yellow pipe leading to the lower deck, the Star Coin can be seen. The player needs to light a Bob-omb near a box blocking the path to access the Star Coin, while looking out for the Rocket Engine on the ceiling.

Enemies Introduced

 * Mega Urchins
 * Porcu-Puffers
 * Huckit Crabs
 * Bloopers
 * Baby Bloopers
 * Blooper Nannies
 * Cheep-Chomps
 * Scaredy Rats
 * Climbing Koopas
 * Fishbones
 * Spike Pillars
 * Mecha Koopas
 * Rocket Engines

Other Appearances
World 4 appears in Mario & Sonic at the London 2012 Olympic Games under the name "Cheep Cheep River" as the location of the Dream Rafting event. Porcu-Puffers, Thwomps, Cheep-Cheeps, and Bob-ombs appear in it, as well as the addition of Gooper Blooper. Also, Wendy (the boss of this level) appears as a costume for the player's Mii.