New Super Mario Bros. Wii (Nintendo Wii)

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Alternate endings

Complete the indicated task to unlock the corresponding ending.

Successfully complete the game with less than 100 Star Coins. The Princess will say "Did I ever tell you about the Secret World?"
Successfully complete the game will all Star Coins from Worlds 1 through 8. The Princess will say, "Oh Mario, tell me about your adventure again!"

Alternate paths

The following levels have secret exits.

World 1
Level 1-3: Leads to a cannon.

World 2
Level 2-4: Warp pipe directly to the castle.
Level 2-6: Leads to a cannon.

World 3
Ghost House: Leads to a cannon.
Level 3-4: Warp to level 3-5 or castle.
Level 3-5: Star Mushroom House.

World 4
Fortress: Leads to a cannon.
Ghost House: Star Mushroom House.

World 5
Ghost House: Leads to a cannon.

World 6
Level 6-5: Castle back door.
Level 6-6: Cannon.

World 7
Fortress: Warp to level 7-6.
Ghost House: Warp to level 7-5.

World 8
Level 8-2: Warp to level 8-7.

Auto Pilot mode

Intentionally fail a level eight times. In Auto Pilot mode Mario will automatically complete a level.

Avoid random encounters

You can encounter random enemies on the world map, To avoid them, activate a Star from your item menu.

Dead player sounds

In multi-player mode, when someone runs out of lives during a level they can hold the D-pad in any direction and press 1 and 2 to make sounds such as a cowbell, drums, clapping, and a horn.

Double Ground Pound (Multiplayer)

With at least two human players you can perform a special double ground pound that has the ability to kill all nearby enemies much like a POW block. You'll need to time your ground pound (press JUMP then DOWN) so both players hit precisely at the same moment.

Easy coins

Stand still, then Spin Jump on a dancing flower to get a coin.

Extra lives

In World 2, you can jump on the turtle as done in New Super Mario Bros. to get extra lives until you choose to stop or until time runs out.

If you are riding on a Yoshi and jump on the bullets seven or eight times you will get as many extra lives as desired.

Kill eight enemies with a star on you to get an extra life. You can keep it going until the star runs out if you are fast enough.

Kill eight enemies with a turtle shell you will get an extra life. You can keep hitting the turtle shell until there are no more enemies if you run fast enough.

Jump on seven turtles to get an extra life. You can keep jumping on the turtles until there are no more to jump on if you are fast enough.

Freeze the Pokeies then do a quick Ground Pound to get at least five extra lives.

Flower Coins

Shake the Wii Remote to spin and jump on any of the small, dancing flowers in the game to make a coin appear.

Hatless Mario

Get 99 lives and Mario will no longer wear his hat. If you complete a level with 99 lives, Mario will not be wearing a hat at the map screen or the next level. He will wear a hat again if his lives drop below 99.

Head protection

When in front of a small item such as a turtle shell, press 1 and shake the Wiimote while picking it up. Holding it over your head will protect you from falling objects.

Knock Out Marauding Enemies

On the world map you'll encounter marauding enemies. To avoid these map screen enemies you can activate a star from your item menu.

Lose Your Hat Easter Egg

Once you get 99 lives, Mario will lose his hat! When you beat a level with a full 99 count, Mario will appear hat-less on the map screen and in subsequent gameplay. You'll regain your hat once you lose a single life.

Make mushroom houses appear in multiplayer

To get a mushroom house to appear in multiplayer, you simply need to clear the level when the time has the same 2 end digits next to each other when you touch the flag pole. Examples: 544, 322, 411. Depending on the two end digits, you will make different mushroom houses appear at the start point, as you would in single player when you save a Toad, only the digits are mostly red mushroom houses. Two zeros at the end will get you nothing. When you do this, you hear the original Super Mario Bros. level clear music and see a number of fireworks depending on what the last 2 digits are. 1 firework for 11, 2 for 22, and so on.

UnlockableHow to Unlock
Gold Mushroom HouseTouch the flagpole with last 2 time digits as 99.
Green Mushroom HouseTouch the flagpole with last 2 time digits as 11 or 22 at the end.
Red Mushroom HouseTouch the flagpole with last 2 time digits as 33, 44, 55, 66, 77, or 88.

Movies

Collect all three Star Coins on a level to the Hint Movie for that particular level.

Mushroom House Bonanza

Beat the game to make all the Mushroom houses in Worlds 1-8 reappear. Collect all the Star Coins and visit every Warp Cannon to make the houses reappear and stay for good.

Mushroom houses

Select a level with a white Toad marker. Listen for Toad when the level starts then break the "?" block that he is inside to free him. Reach the end of the level to make a mushroom house appear. The following types of mushroom house with a mini-game or reward will appear, depending on the last number of the timer when you collect the flag to end the level.

Green house with 1-Up Cannon mini-game: Last number of the timer is 0, 1, 2 or 3.
Red house with Match mini-game: Last number of the timer is 4, 5 or 6.
Gold house with Star reward: Last number of the timer is 7, 8 or 9.

Successfully complete the game to gave all Mushroom Houses in Worlds 1 through 8 reappear.

To have Mushroom Houses to appear in multi-player mode, complete the level with the last two numbers of the timer have the same digit, except for zero. The original Super Mario Bros. level completion music and fireworks will confirm that it has worked.
Gold Mushroom House: Last two numbers of the timer is 99.
Green Mushroom House: Last two numbers of the timer is 11 or 22.
Red Mushroom House: Last two numbers of the timer is 33, 44, 55, 66, 77, or 88.

Save Anywhere

After you beat the game (beat World 8-Bowser's Castle) you'll be able to "hard save" anywhere you'd like. The option replaces the Quick Save option.

Save option

Complete the final castle of World 8. A "Save" option will replace the "Quick Save" option, allowing you to save anywhere on the map.

Sounds From Beyond the Grave

When you're playing multiplayer and one of the players runs out of lives mid-level, he or she can still contribute to the game from the Great Beyond. Each direction of the D-pad is mapped to a different sound effect. Hold a direction and hit the 1 and 2 buttons to trigger different sounds, including clapping, a horn, kick and snare drums, and of course cowbell. The unfortunate players waiting for the level to end can add a drum line to the music.

Stealing Red Mushroom Houses (Multiplayer)

When playing multiplayer you can steal your teamates turn in the Red Mushroom House match game by performing a ground pound on him.

Super Guide mode

Intentionally fail a level eight times. You will now be able to hit a green "Super Guide" block marked with a "!" in the level. This sets the game on auto-pilot and Luigi will automatically complete the level for you. Note: This is not available in World 9.

Super Mario Bros. 3 and Super Mario Galaxy reference

During the introduction sequence, you can see Bowser Jr. and the other Koopalings leave after kidnapping Princess Peach and taking off in an airship from Super Mario Bros. 3 and Super Mario Galaxy.

When you enter the airship the background music is the airship song found on Super Mario Galaxy.

Super Mario Bros. and New Super Mario Bros. references

Reach the goal with a time of 11, 22, 33, 44, 55, 66, 77, 88, or 99 to see from one to nine fireworks.

Super Mario Bros. reference

Complete the first level or any level while rescuing a captured toadstool in single player mode to hear end of level music from Super Mario Bros.

Title screen stars

Complete one of the indicated tasks to unlock a star at the title screen.

Successfully complete the game.
Successfully complete all normal levels.
Collect all 207 Star Coins in Worlds 1 through 8.
Complete World 9 with all 24 Star Coins.
Complete all levels with all alternate paths (all Warp Cannons and Mushroom Houses used).
Additionally, successfully complete all levels without unlocking the Super Guide Block (do not die eight times) to unlock sparkling stars.

Turtle Tipping for 99 Lives

You can use the decades old turtle-on-the-stairs trick from Super Mario Bros. to get 99 lives in New SMB Wii. Go to world 2-3 and, at the end, right before the flag, you'll find a set of steps and a turtle ambling down them. If you time your jump just right you'll continue bouncing on the shell collecting lives until you max out at 99.

Unlimited Coins (World 4)

In a two-player game, enter World 4's final castle. Make sure that at least one player has Ice power (either the flower or the penguin suit will suffice). Work your way through the level until you reach the first panel that you can pound in order to switch to the back of the grate. Have one player (the one with Ice power) stand on the rightmost "?" block just to the left of the panel. The other player should climb the grate to reach the switchable part, carefully avoiding the Koopa while climbing. When the Koopa is on the back of the panel, have the player with Ice power freeze it, and have the second player slam the panel around. The Koopa should now start spewing an endless stream of coins.

World 9

Successfully complete the game to unlock World 9. The levels in World 9 are only available if all Star Coins are collected in the previous Worlds.

Level 9-1: Collect all Star Coins in World 1.
Level 9-2: Collect all Star Coins in World 2.
Level 9-3: Collect all Star Coins in World 3.
Level 9-4: Collect all Star Coins in World 4.
Level 9-5: Collect all Star Coins in World 5.
Level 9-6: Collect all Star Coins in World 6.
Level 9-7: Collect all Star Coins in World 7.
Level 9-8: Collect all Star Coins in World 8.
Level 9-9: Collect all Star Coins in all previous levels of World 9.

Yoshi's Island series reference

After defeating the Koopa Kids once, Kamek casts a spell to make them tougher for the rematch. In Yoshi's Island and Yoshi's Island DS, he also cast spells on those Bosses that made them tougher.

When fighting Bowser after you press the button, Kemek will cast a spell on Bowser to make him bigger and stronger. This also happens in Yoshi's Island DS.