To unlock level 8-7 on new Super Mario bros wii:
1) Go on level 8-2
2) When you enter the level, go down the first pipe you see.
3) When you have gone down the pipe, hit the first ?box.
4) Go to one ? box, and then run to the next one directly after it.
5) Get to the checkpoint flag, and pass the red ring hoop.
6) (On the last brick blocks, hit them and you will find a star power)
7) In the next question box, there is an ice flower.
8) Jump up on the red, then yellow pipes, and get to the little bridge thing. (Second red one)
9) Get on the spinning rock, and go backwards into the green pipe.
10) There, you will find coins and spinning flooring.
11) Jump up on the last red bridge, and go up the pipe, the furthest to the right on your screen.
12) Jump on the red flag, and it will onlock 8 - 7.
Basically, all you have to do is complete the level 8 - 2 on the red flag.
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They call it Super Mario Bros Wii for a reason
For New Super Mario Bros., You reach level 7 by defeating the level 5 final boss (Petey Piranha as mini Mario
By getting a cannon or by winning the fifth castle and then the sixth castle.
First, u get mini Mario the go to World 2 and beat the boss with mini Mario. It will unlock World 4.
There are nine worlds in New Super Mario Bros. Wii. When you get all of the Star Coins in World One you unlock World Nine Level One and so on. World Nine is like Rainbow Road on Mario Kart.