Gold Block

Gold Blocks are golden Brick Blocks that appear in New Super Mario Bros. 2. They appear when Mario or Luigi continuously hit a Coin Block until it turns golden. When this happens, Mario or Luigi can wear the Gold Block over his head, thus producing coins from it if he keeps moving, making it very similar in function to the Question Boxes from Super Mario 3D Land. If Mario or Luigi runs fast enough, the amount of coins produced from the block increases. When a Gold Block is worn, the face side of it resembles Mario/Luigi's face, as shown in the image below. The Gold Block eventually disappears after a while.

Flying Gold Blocks also appear in the game. Because there are no Coin Blocks that fly in the game, Flying Gold Blocks are not hidden within them and are instead seen flying around in their idle golden forms.