What is the secret to get to the black tube on world three?
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In the world 3 ghost house,go to the room with the stairs going over like an upside down V. Go over to the right side & find the ? Block. When you hit it, a nearby door will appear. IGNORE IT; instead go back over the sets of stairs to the other side, & you'll see a new door. But be quick, once the timer stops, it will disappear. Through this door is where the secret exit is (this will unlock the path to the cannon).
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