World 6 (New Super Mario Bros. 2)

World 6 is the sixth and final normal world in New Super Mario Bros. 2. This world is a lava world, similar to World 8 of New Super Mario Bros. Wii and New Super Mario Bros. This world can be accessed by completing either World 5-Castle or World Flower-Cannon. There are four Toad Houses in this world, two red, one green, and one yellow.

There are 10 levels in this world, 6 of them are the normal levels, one of them is a Ghost House, one of them is a secret level, and there is also a Rainbow Level. Bowser is the boss of this world.

To access this level, the timer must end with the two digits '66' (that is, 'x66', where 'x' can be any number) when the player reaches the flagpole of any World 6 level(not Fortesses or Castles). Once the level is completed, it can be accessed again by satisfying the above condition once more.

In this level, Mario or Luigi has to bounce on pink mushrooms to collect spinning circles made out of coins. There's a Red Ring in this level: if the player collects all 8 red coins, they'll receive a Gold Flower in their item storage.

This level contains many Raining Debris and POW Blocks. The Plumbers must either hit the POW blocks to get coins faster from Brick Blocks or let the Debris hit it. Then the player should continue and more Raining Debris falls. After the Checkpoint, Mario or Luigi must hit a switch then go up a bridge quickly. The raining debris will smash the bridge breaking it. The second Star Coin is trapped at the end of the bridge surrounded by the bricks. The raining debris must hit it. The player must get it before the debris smashes the ground. Then Mario will find the Flagpole.

Star Coins

 * Star Coin 1: It is on the top of the platform near the first quarter of the stage. The player can get it using Buzzy Beetle shell or continue without getting hit by a Raining Debris.
 * Star Coin 2: Right after the Checkpoint, Mario or Luigi must go to the bridge. Then near the end, the player must wait for a Raining debris to hit and then get it.
 * Star Coin 3: Right next to the stairs near the Flagpole is a hidden block with a vine. The player must climb it to get the last Star Coin.

This Ghost House is a difficult maze. Mario must press the P-Switch at the end of the room and go in the right door. Then, the player must head right until they see a door. Mario should go inside. What looks like the same room is actually different, as the Big Boo has 'turned into' a Boo. Mario must then press the P-Switch and head left. When Mario gets to the first part of the room, he should lure away the Boo from its position, and press the P-Switch that it was hiding. Some stairs will then be visible, and Mario must climb them. At the top is a door that Mario must enter. Then the player will be in a room with the first Star Coin (see below). Mario should not enter the door located on the bottom of the room. He should instead wait for a block that has a P-Switch on it. When it is pressed, a path is made to the exit door.

Star Coins

 * Star Coin 1: At the end of the first room, the player must hit the ? Switch. They should then fall down, head right, hit the Brick Block and press another ? Switch. Up ahead is the first coin.
 * Star Coin 2: In the third area, The player must continue left and find a ? switch to reveal the path to the second star coin.
 * Star Coin 3: In the second area (After leaving the third area), the player should continue to the right and find a ? switch to reveal a hidden door that leads to the third star coin.

Secret Exit
After the player hits the ? Switch, they must wall jump up to the star coin, but instead of heading back down, keep wall jumping and a they will come to a door leading to the secret exit. The Secret Exit unlocks World 6-A.

Star Coins

 * Star Coin 1: The first star coin is found directly to the right of the first two Mini Goombas the player sees.
 * Star Coin 2: The second star coin is surrounded by brick blocks. The brick blocks can easily be broken so that the player can catch it.
 * Star Coin 3: The third star coin is blocked with stone blocks. The player needs to use the Para-bombs to destroy it.

A payment of 5 Star Coins is required to unlock this level.

Completing this level unlocks World 6-Fortress, skipping World 6-3.

Star Coins

 * Star Coin 1: When the player reaches the third moving platform, he/she must take the lower path to find the first star coin.
 * Star Coin 2: Before the green pipe that's halfway through the level, there's a hidden block with a Beanstalk that's surrounded by three ordinary Coins. The beanstalk leads to a secret area with the second star coin.
 * Star Coin 3: Not too far after the Red Coin Ring, the third star coin is seen floating above a Bullet Blaster.

Star Coins

 * Star Coin 1: This coin is on top of an extending magenta mushroom platform, but covered in Brick Blocks. The player must use the nearby Red Koopa Troopa shell to get rid of the bricks that block that star coin.
 * Star Coin 2: When the player sees the second Fire Bro., he/she must enter the yellow pipe to take him/her to a secret room with two Fire Bros. and the star coin.
 * Star Coin 3: Before the exit, the player must run on the brick block ceiling instead of the lower magenta mushroom platforms to find a hidden path to the third Star Coin.

To access this level, the player needs to complete World 6-Ghost House via the secret exit.

Completing this level unlocks World 6-Fortress, skipping World 6-2 and World 6-3.

Star Coins

 * Star Coin 1: The star coin is in plain sight in the air. The player must jump on the Dry Bones to reach it.
 * Star Coin 2: Shortly after the first star coin, it's seen above a gap. It's already in the player's way, so he/she must simply jump to get it.
 * Star Coin 3: Raccoon Mario is required for this coin. Mario or Luigi must fly up to the platform that's up-left to the ladder-like platforms.

Star Coins

 * Star Coin 1: The first star coin is in plain sight, but Mario or Luigi can't reach it unless they temporarily turn off the Rocket Engine that's blocking it.
 * Star Coin 2: The player must enter the door left of the Checkpoint Flag (And turn off the Rocket Engine). The door leads to a large room infested with Rocket Engines. The second star coin is at the very top of the room.
 * Star Coin 3: Just before Mario or Luigi fight the Renzors, There's a green pipe that's yet again blocked by a Rocket Engine. After deactivating it, the green pipe will lead the player to a room with circling rocket engines. The player must climb the rocket engines to find the third star coin.

Star Coins

 * Star Coin 1: As soon the level starts, head left to get the first coin.
 * Star Coin 2: Once Mario or Luigi see the first spinning Brick, jump on top to reveal a hidden block with a vine. Climb it to get the second coin.
 * Star Coin 3: The third coin is being circled by Peepas towards the end of the level.

Star Coins

 * Star Coin 1: The first star coin is located in a secrect area. The player can access this area with the red pipe directly above the teeter-totter with two Spiked Balls on it.
 * Star Coin 2: Atfer the checkpoint, the second star coin is buried underneath Used Blocks. Mario or Luigi must lure a spiked ball to destroy the blocks.
 * Star Coin 3: Very close to the Flagpole, the third star coin is on the higher teeter-totter between two spiked balls.

This level is similar to World 8-Bowser's Castle in New Super Mario Bros. Wii. In the first section of the level, there will be rocket engines on the rope moving near the lava. Then Podoboos and Dry Bones walking near the stage. The Rocket Engines will starting turning on and off near the middle of the first section. Near the stages going up, on the very right, there will be a Brick Block which will turn into a Gold Block. In the second section, Mario/Luigi must ride on the Snake Block. Before the blocks pass the platform with the Star Coin, the player must jump down to the platform to reach the Star Coin. Then the player must avoid the Rocket Engines while the Snake Blocks reach the platform on the door that leads to the third section. Once the player enters the third section, the Koopalings will ride on Bowser's Koopa Clown Car and try to blast the player. In order for the player to dodge, they must go behind the walls although the platforms are moving. If the player is shot, they will temporarily turn to stone. Near the middle of the section, there will be sets of Donut Lifts. On the first set in the middle row, the player must ride down the Donut Lift to get the Star Coin. After getting the Star Coin, the player must jump on another Donut Lift or the platform in order to stay alive. Then the player will enter the room to the final battle.

The final battle is the same as in World 8-Bowser's Castle from New Super Mario Bros. Wii. Instead, the player gets a checkpoint right after the gate and gets three Item Blocks containing two Fire Flowers and a Raccoon Leaf. After the player gets the power-ups, they must go up the steps and dodge the fireballs that Bowser blows and then finally battle Bowser. Like most of the previous games, Mario must get pass Bowser and press the ! Switch to knock him into the lava. Like New Super Mario Bros. Wii, instead of Kamek sprinkling Bowser and getting knocked out, the Koopalings sprinkle their father and get knocked out when he is enormous. Instead of going to the right to rescue Peach, this time the plumbers must go up the platforms before the lava reaches him. Bowser will smash the platforms and when the player reaches the top Bowser will jump and they hit the giant ! Switch. The lava then moves away making Bowser fall out of the castle and Peach is rescued.

Later on, the Koopalings put Bowser into the Koopa Clown Car but fail once Bowser fits and the Koopalings do not so they are knocked down to a tree.

This course is never selected in the Coin Rush game mode, due to the sheer length of the Bowser battle.

Star Coins

 * Star Coin 1: The player must jump straight up while on top of the third Rocket Engine to reveal a Hidden Block with a 1-Up Mushroom in it. The player then must climb that block to reach a secret area with the first star coin.
 * Star Coin 2: In the second section of the level right after Mario go on the Snake Blocks, near the Item Block, jump down to the platform to reach the Star Coin before the Snake Blocks pass the platform.
 * Star Coin 3: In the third section on the first set of Donut Lifts in the middle, the player must ride down one of the 2 middle Donut Lifts to get the coin. Immediately after getting the coin, the player must jump off the Donut Lift and go to another one.