Unlock world 5
Go to world 2 the third level and end the level a different way. The way to end the level a different way is to get to the part where you have to push the question mark button then when the water rises go to the hole which is up then hit the button to make the water go even higher but do it before the water starts to go down. After you hit the button swim up and you will end the level a different way but you have to see the red flag. P.S. The red flad means you will warp.
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