Bonus block

A Bonus Block is a special green block with a white star on it that appears in certain levels of Super Mario World. If Mario and Luigi collect at least 30 coins in the level and then hit the block, a 1-Up Mushroom will pop out as a reward. If they do not have at least 30 coins, the brothers will only obtain a single coin. Some of the levels this block can be found in are Yoshi's Island 3, Butter Bridge 1, Donut Plains 3, and Chocolate Island 3.