World 8 (New Super Mario Bros. Wii)

World 8, or Bowser's Volcano, is the final world of New Super Mario Bros. Wii, excluding the secret ninth world, Rainbow Path. The world has a grand total of ten levels.

The Tower here leads to a fight with Kamek, who previously in the game is only seen enhancing the Koopalings when the heroes reach them in Castles. This world also features the third and final fight with Bowser Jr., once again on an Airship. The final level here features the two-part battle with Bowser, who is not once seen in the game up until that point. The Enemy Course in the level are Podoboos between 8-3 & 8-Tower; on the bridge.

8-1 (Fiery Danger Zone)
In World 8-1, Mario and Co. have to go through a volcanic area full of lava. Raining Debris fall from the sky, which are hard to dodge as there are rising lava spouts, which block the players temporarily from progressing further if they don't have the Propeller Suit. Also, a cloud of hot ashes will chase the players from the left to the right. The hot ashes will instantly take out the heroes on contact, so they have to hurry.

8-2 (Wheel of Bowser)
This level contains more falling debris and with spinning wheels on the ground. As soon as Mario and the co. enter the pipe, they end up in an underground area filled with more lava. Goombas will appear many times on this stage, along with the spiked balls. The team will just have to dodge the obstacles and will get through. However, there is a secret exit, after the Mario team passes a yellow and a red pipe, they will see more spiked balls rolling forward slowly. Right at the ledge, if the team drops down and heads right to the wall, a secret entrance will allow them to enter a pipe further if they keep heading right.

Once gone into the pipe, the team will see that the ground is spinning very fast. They'll have to either keep jumping until the end. They must also watch out that Goombas can appear on the spinning ground. Once they get through, they'll open up the secret exit to 8-7.

8-3 (Cave Waves)
This level starts out with huge lava waves, if Mario and Co. aren't careful and land in the lava, they instantly lose a life. It contains mostly platforms that sink into the lava, but rises back up if jumped off. If Mario and Co. are patient and are careful, they can get through easily.

Enemy Course

 * Four Podoboos
 * Six Podoboos
 * Nine Podoboos

Best course of action in these Enemy Courses is the use the Ice Flower against the Podoboos, being the only way to defeat them.

8-Fortress (Kamek's Tower)
This tower features the Fire Bars, which can mean problems for the players.

Kamek is fought at the end.

8-4 (Drenched Darkness)
at the first part of the level on the platforms at the top stone spikes throw down their boulders and in the water are bulbers(they look like angler fish) the second part of the level is infested with jellybeams. Try not to kill them because they are your only light source in that part of the level. When you go up the pipe you make it to the exit.

8-5 (Raft Ride of Doom)
This course is a side-scrolling course, featuring platforms that can be moved by rotating the Wii Remote. At the start, Bob-ombs will descend by parachute to try to harm the player. Past the checkpoint flag, lava geysers and even Crowbers will try to overwhelm the player. If the player isn't careful, he/she may fall into the lava below.

8-6 (Bowser's Volcano Interior)
This course features rising lava. The player will have to advance upward real quickly to avoid it. All of the Star Coins are in plain sight, but a few are tricky to get to.

8-7 (Bonecoaster Fun Park)
The level is secret, in which can only be unlocked by taking the secret path on World 8-2. This is the first and only level were players will see the Bonecoasters. There are a total of five coasters throughout the level (two at the underground section, three at the above ground section). The Bonecoaster helps the four dodge the lava geysers that are constantly shooting from the lava. The first Star Coin is located on the second Bonecoaster, where it is barely above the lava, which Mario, Luigi, Blue Toad, or Yellow Toad must grab as the Bonecoaster comes out of the lava. The second star coin is located above two lava geysers, which the four must jump off the third Bonecoaster to grab it. The last star coin is found between the four and fifth Bonecoaster. Mario and co. must stay on the fourth Bonecoaster, grab the coin, and jump to the fifth Bonecoaster before they touch the geyser. After the Bonecoasters, it is a short jump onto the flagpole, which leads Mario and friends to 8-Airship.

8-Ship (Cannon Airship)
The last Airship level in the game. The main enemy in the course is the Mecha-Koopa, but the biggest danger in the level is the cannons and the players will have to dodge a barrage of cannonballs at one point. At the end is the last battle against Bowser Jr..

8-Bowser's Castle
Despite being the last castle, Bowser's Castle is much shorter in this game than it was in New Super Mario Bros..

For the first (out of 2) room, there are lots of Podoboos, which will jump out of the lava and try and get the player. The second room has lots of falling platforms and sinking lava, but sadly the platforms fall faster than the lava sinks! Last room there is is a big green door leading to Bowser himself.

Bowser will spit fireballs at Mario, and then he'll see the fiery behemoth. Mario has to hit the switch at the other side of Bowser to save... Kamek? Kamek will then make Bowser grow, but to his astonishment, Bowser grows too much. He spits fireballs at the plumber and breaks the walls (or obstacles). Eventually, after hopping on countless numbers of floating platforms, Mario will see a big switch at the end of the room, with Peach above. Mario hits it, causing the lava to sink, along with Bowser. Peach falls down, and they go outside.

Two balloons come, one with Luigi and the other with Blue Toad and Yellow Toad. Luigi offers Mario and Peach a ride, but they leave him behind. Then, the Toads let him go in their balloon and they rode off. Peach asks Mario if she told him about the secret world and Mario shrugged. After the credits, the scene goes to Bowser, where all the Koopalings (except for Larry and Lemmy) try to flip the shrunken Bowser and succeed. Then, the vibrations of that make Bowser's Castle fall down on the Koopa family (apparently).

Enemies Introduced

 * Para-bombs
 * Bulbers
 * Jellybeams
 * Firebars
 * Cannonballs