Rocket
From the Super Mario Wiki
The Rocket is an item in Super Mario Bros. 2. It can be randomly plucked from the ground, just like Vegetables, and acts as the "door" to the next level, taking Mario, Luigi, Toad or Princess Peach upwards. After a certain height, the player's character jumps out of it, and it explodes shortly afterwards. It only appears in Worlds 4 and 7 of the game.

