Haw to get the green tube on world 2-3 cheats for New Super Mario Bros

Haw to get the green tube on world 2-3

Go down the first green tube go down and follow the path utill you get to the water bit press the ? Butten and swim relly fast up to the top you will se a little gap go through that but be fast as there is another ? Butten that you need to press befor the water goes again then when you have doun that run doun the little corrie door and you will come out of a green tube and you will see a red flag jump on the flag and then you would have unloked a water world do that and then you will have unloked the tube that takes you strate to the end castle in world 2 pleas tell me what you think if you try my cheat

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