World 1-1 (Super Mario Bros.)

World 1-1 is the first level of World 1 in Super Mario Bros. and is the first level in general of the entire Super Mario series. The first screen of the level is also the game's title screen when starting it up. It contains the basics of the Super Mario Bros. game, getting the player ready for the journey ahead. The level consists of Super Mushrooms, standard enemies such as Goombas and Koopa Troopas, a lot of Coins, a hidden secret bonus area that will allow the player to skip most of the level, Fire Flowers, pits, and a flagpole at the end.

Due to its iconic notability, the level has been re-created in many games, including Super Mario Advance 4: Super Mario Bros. 3, New Super Mario Bros. Wii, New Super Mario Bros. 2 (as part of the first stage of the Gold Classics Pack), Super Smash Bros. Brawl, Super Paper Mario, and Super Mario Maker for Nintendo 3DS as the first level of Super Mario Challenge.

Layout
World 1-1 starts out on a brick path. As Mario moves forward, a Goomba appears and starts walking toward Mario. Mario also reaches the first Question Block of the game, and afterward the six block triangle formation of ? Blocks and regular brick blocks (with a Super Mushroom inside the left block). A set of Pipes can be found, with Goombas located in between them. The final pipe among the set leads to a bonus area of coins and can be entered to bypass much of the level. After that, assuming the pipe was not taken, there is a hidden 1-Up Mushroom Block and a gap followed by another Question Block containing an item, possibly a Super Mushroom or Fire Flower, depending on Mario's health. Additionally, Goombas start falling down from a long row of blocks above.

Afterward, a block down below contains ten Coins that Mario can retrieve by jumping repeatedly underneath the brick. Then there is a notable ? Block triangle formation, which contains no regular blocks. The top block contains a Fire Flower (or a Super Mushroom if Mario is small). Brick Blocks and ? Blocks can be found, followed by a pyramid-like set of unbreakable blocks with a gap in the middle. After that is another set of unbreakable blocks, this time with a gap in the middle that Mario can fall into and get killed. Just following is another pipe that cannot be entered (which is the exit from the bonus area mentioned earlier), accompanied by two Goombas and a set of ? Blocks with coins inside.

Lastly, Mario reaches the ending staircase for the level, and the Flagpole afterward, which is reused in all underground and underwater stages in the game.

Super Mario Bros. Deluxe challenges
In Super Mario Bros. Deluxe, the player can collect five Red Coins, find a hidden Yoshi Egg, and get a medal based on their score. The Yoshi Egg is found in a Hidden Block within the first set of pyramid-like steps, and the score to beat is 32000. The Red Coin locations are:
 * On the row of blocks at the start of the level.
 * In the first ten-coin block after the second pit. The player needs to collect all the coins first before the Red Coin appears.
 * In the third ? Block soon after the second Red Coin.
 * On top of the Brick Blocks soon after the third Red Coin. The player needs to use the single Brick Block as a platform.
 * In the final ? Block of the level.

Enemies

 * Goombas
 * Koopa Troopas

Level statistics

 * Power-ups: 4 (Three Super Mushrooms or Fire Flowers and one Super Star)
 * 1-Up Mushrooms: 1
 * Secret areas: 1

Trivia

 * A license plate in the Mario Kart: Double Dash!! course Mushroom City has "W 1-1" written on it, referencing World 1-1. The same license plate can be seen on cars in Moonview Highway in Mario Kart Wii.
 * According to Shigeru Miyamoto, World 1-1 was was the last level created in the game.