Hit the flagpole, and when you're taken back to the Map the road to the Warp Cannon will unlock. Hurry, and be careful not to get yourself squished! You'll be taken to a room with a Golden Pipe - go through the pipe to get to the very end of the level. Go through the door and follow the Snake Blocks through the hole on the right of the screen. Just after the Midway Flag, you'll see a door.

To do this, go to the first castle(Or tower) in that world. Completing the castle unlocks World 2.To get to the Mushroom World, you need to unlock the Warp Cannon in World 1.

Bowser is fought at the end of the level. This first castle level in the game, filled with lava with Podoboos, in addition to moving platforms and Dry Bones as obstacles. It is the first level to use auto-scrolling. This takes place underwater with many Sushis and Cheep Cheeps. This level is themed around Bouncy Mushrooms. This level introduces Koopa Paratroopas and the Mini Mushroom power-up. This level takes place in a grassy plains area with lots of hills. Snowy mountains from said world can be seen in the background. This Warp Cannon takes the player to World 5. This tower is the only one in the entire game to house a secret exit, and getting it unlocks a Warp Cannon which takes the player to World 5. It features moving platforms, some of which have spikes on them, as well as Dry Bones as enemies. This level features a lot of mushrooms, and introduces Spin Blocks. This level takes place high above the sky. This level is the first to have a secret exit, which will unlock a route to a red Toad House and World 1. The level also introduces Piranha Plants. It is heavily inspired by World 1-2 from Super Mario Bros. This level takes place in an underground cave.

This level introduces power-ups such as the Super Mushroom, Fire Flower, Starman, and the Mega Mushroom. It takes place in a grassy area beside Peach's castle, with Goombas and Koopa Troopas. This level introduces the players to the game. World 1 is also surrounded by bright blue water, which also connects to World 1-A. Peach's castle can be seen in the background right before World 1-1. Behind the tower, many rocky cliffs can be seen with dark green grass on them. There are also some brick blocks lying around the map. It takes a grassy plain filled with bushes, mushrooms, fences, and flowers.

The appearance of World 1 is very simple.

World 3-cannon super mario bros 2