Expansion Block
From the Super Mario Wiki
An Expansion Block is a block that resembles a pink Egg Block in Super Mario World 2: Yoshi's Island. However, it does not release eggs, instead an Expansion Block expands to help a Yoshi reach higher distances. However, if a Yoshi took too long to jump off of the Expansion Block, it would shrink back to it's normal size.
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| ! Block | ? Block | ♪ Block | 4-Bros. Random Block | Arrow Block | Aurora Block | Bonus Block | Brick Block | Bros. Block | Coin Block | Command Block | Dice Block | Dotted Line Block | Drop Block | Egg Block | Event Block | Expansion Block | Giant ? Block | Giant ! Block | Grab Block | Heart Block | Hidden Block | Hint Block | Ice Block | L Block | Laser Block | M Block | Marshmallow Block | Metal Block | Minus Block | Mushroom Block | Perry Block | Pink Block | Plus Block | POW Block | Pushing Block | Rally Block | Random Block | Rock Block | Save Block | Shine Block | Simu-Block | Spin Block | Star Block | Stone Block | Super Block | Triangular Block | Turning Block | Used Block | Warp Block | Wooden Block | Yellow Block | Yoshi Block |


