World 6-3 (Super Mario Bros. 2)
World 6-3 is the third level of World 6 in Super Mario Bros. 2.
There is a shortcut at the very beginning of the level that will take the player directly to Birdo. There is a wall to the left of the top of the ladder with quicksand underneath it. The player can use the quicksand to pass under the wall to reach a door on the other side, but must press the Jump Button(s) repeatedly to avoid losing a life.
The enemies of level 6-3 include Tweeters, Bob-ombs, Ninjis, and a few Hoopsters; the environment is cave, desert, and sky. Before battling the boss of World 6, the player must defeat a red Birdo with a Mushroom Block and Birdo Eggs. After Birdo is defeated, the player will enter a fight with Tryclyde (Mouser in Super Mario Advance). This level is notable in that no key is found in the fortress, but this is because it was already used in 6-1.