Blue Coin Block
From the Super Mario Wiki, the Mario encyclopedia
When Mario finds a Blue Coin Block and ground-pounds it, Blue Coins show up nearby. Mario has a short time to gather the Blue Coins, after which they disappear. The block cannot be reused. The number of Blue Coins that appear varies with each course, ranging from two to ten or more; they are often necessary to obtain the 100-coin Power Star from the levels they appear in. During the time that Blue Coins appear on the screen, a timer can be heard, which ticks faster when the time is running out. Due to its role, it is comparable to the Switch Block, except that it does not change coins into Brick Blocks and vice versa.
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