How do you get to the cannons in new super Mario bros wii?

Answer 1

World 1's is in 1-3, get yoshi, near the end is a ledge by the venus fire trap, flutter jump ABOVE that ledge, go right to a secret pipe. goes to world 5.

World 2's is in 2-6, get the propeller mushroom, at the end, before you go down the pipe, jump, propell up, and a secret pipe is up there. goes to world 5.

World 3's is in the ghost house, when you get to the ropes going sideways, there will be 4 groups of coins with 2 each, go to the third set and drop; the star coin is there, too, in a secret place on the right. goes to world 6.

World 4's is in the tower, when you see the final star coin, you will also see green stones on the left, get in the pipe before it's to late. goes to world 6.

World 5's is in the ghost house, go up the stairs jump the 1st gap fall into the next 2, it may look like only 1 door, but go left behind the wall. goes to world 8.

World 6's is in 6-6, when you get to the fire bros, go up to them and near the second one, a red pipe. goes to world 8.

World's 7, 8, and 9 don't have cannons.