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An Expansion Block is a block that resembles a pink Egg Block in Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3, Yoshi's Island DS and Yoshi's New Island. However, it does not release eggs. Instead, when struck from below, an Expansion Block expands to help a Yoshi go higher. However, after a set amount of time, Expansion Blocks shrink back to their normal size.
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