All enemies on the screen will be turned into coins when Mario reaches the Giant Gates.
If Mario manages to collect all 50 of a single gate's Goal Stars, he will be additionally rewarded with three 1-Ups. If he carries an item (such as a Key or Jumping Board) through the gates, he will receive a power-up based on his current status and his Reserve Item. If the last two digits of the timer are a multiple of eleven, and the same as the tens digit of the number of Goal Stars Mario receives, he'll be given a 1-Up. If all these conditions are met, and Mario completes the Bonus Game perfectly, it is possible to receive a total of 13 1-Ups at the end of the level.
If Mario fails to hit the bar, it turns into a coin, and no Goal Stars are rewarded.
Giant Gates are often protected by enemies, especially Chargin' Chucks. Though this may hinder the player from finishing the level, it also gives him the chance to get a high amount of Goal Stars by jumping on the enemy. This allows him to do a very high jump and thus to reach the bar when it's at the top of the gate.
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