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Drop the Key when necessary, and keep an eye out for marauding Ninji. You must work fast to get the Key and avoid taking damage. When you take it from the Key Room, Phanto will come after you. Here's the key that unlocks door E in map C. Move sideways and go up and down the steps to avoid them.
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Shyguys are coming out of the jars one after another. If it helps, you can use a POW to do them in. They will do everything they can to give you a hard time. You can get to the Mushroom if you drop the Potion between the door and the ladder, but look out for Ninji and Spark. Then exit out back to map B and return to repeat the process all over again. You'll earn plenty of points and some extra lives as well. Run left until you see some Ninji and Sparks, then toss the block and chase after it. This makes it possible to use the new super sized POW block at the entrance to map C as an effective way of maxing out your lives. Max out your lives in Advance: Super Mario Advance adds a score to the mix, along with the possibility of earning extra lives by defeating enough enemies with one attack.
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Then try using it to unlock the door to the left. Which one should you pick? The center door has a dead-end. Which door will you choose? There are three-count 'em-three doors here. You'll still be holding on to the copy when you return. If you have a POW inside Sub-space, and Sub-space disappears, you'll get two POWs! Don't forget to take the Mushroom before lifting the darkened POW up high. (1) Sub-space 1 and Double POWs! Here in map B, you'll find something really weird.
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