That's a cool enemy that appears a lot in the beginning of the game.
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Some of the pipes are accessable and they will take you down to other areas of the level. Some of those areas look like this, other are different. *Shrugs*
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This is the world map where you move around between levels.
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If you're riding a Yoshi and get hit by an enemy Yoshi will run away. But you can get him back by catching up on him and jumping back on to his back.
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OMG SPOILER
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//Benny & Marshall
