How do you unlock the cannon in World 3?

How do you unlock the cannon in World 3 in New Mario Super Bros. DS? All I need to know is which level and where in that level. Any help will be appreciated! :-)
Best Answer
In the Ghost House 3, go all the way to the right in first area. Hit the brick to reveal an ? switch. Jump on it, and a door will appear, but you need to enter another one. Quickly run back to the previous switch, you'll see two doors next to that switch, and be sure to enter the left one before the hurry music is over, or the door will disappear. If you fail, you still can practice up and try again.
Source: Gamefaqs
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How do you get to the cannon in World 3?
To get to the Flower World, you need to unlock the Warp Cannon in World 3. You get there by going the secret route in the World's first castle - but you'll need to be mini Mario for it to work. You can get a couple of Mini Mushrooms in Level 3-B.How do you get to the cannon in world mushroom?
To get to the Mushroom World, you need to unlock the Warp Cannon in World 1. To do this, go to the first castle(Or tower) in that world. Just after the Midway Flag, you'll see a door. Go through the door and follow the Snake Blocks through the hole on the right of the screen.How do you get the cannon in World 4?
The Secret Goal leading to this cannon is in World 4-Fortress. In the falling block area where the final Star Coin resides, there's also a secret passage to this fortress's red flag exit. Let the block nearest to the wall under the coin fall and then run over it and into the secret passage.How to get the cannon on world 3 super mario bros wii
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