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 and Super Mario World: Super Mario Advance 2. If Mario or Luigi collects at least 30 coins in a level and then hits the block, a 1-Up Mushroom will pop out as a reward. If either brother does not have at least 30 coins, he will obtain only 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.