World 1-3 is the third level of World 1, and subsequently, of New Super Mario Bros..
The level starts off with a few tilting mushrooms where Mario can find a block with a Super Mushroom or a Fire Flower. In the next area, there are a few Spin Blocks that makes the player Spin Jump very high. If the player Spin Jumps onto a platform higher in the area, it leads them to a bouncy mushroom below the first Star Coin in the level. The player also finds a path of coins in the air. If the player follows the path, they are led to another Star Coin. After collecting that the coin, the player can go onto several tilting mushrooms in the air. The player can get the level's last Star Coin here. Afterwards, the player finds a Red Ringwhich makes Red Coins appear. There are also more mushroom platforms. There are then two more tilting mushrooms which lead the player to the level's Flagpole.