World 1-1

""Mario fans don't need an introduction to this classic level, but may find it a bit different from how they remember it. I wonder if those Question Blocks still have power-ups inside...""

World 1-1 is a stage in Nexed, resembling an abridged version of the level of the same name from Super Mario Bros.

History
World 1-1 is the first stage in Super Mario Bros., designed to get players accomodated with the mechanics of the game. Despite it being the first stage in the game, it was designed later in development according to Shigeru Miyamoto, as stages created earlier were deemed as more suited for the late game.

World 1-1 has gone on to be one of the most recognizable video game levels in history, with many praising it for its approach to teaching players how Super Mario Bros. functions. As a result, the level has reappeared in various Mario titles, such as Super Mario Advance 4: Super Mario Bros. 3, New Super Mario Bros. Wii, and Super Paper Mario. The level also appears as a stage in the Super Smash Bros. series (namely Brawl and Ultimate), although the Nexed version of World 1-1 differs greatly from its layout.

Layout
World 1-1 is entirely created with 8-bit graphics resembling those used in Super Mario Bros.. The background depicts a blue sky with clouds resembling those found in the original game.

The stage takes place on a flat body of land with a slope on each side, leading into the bottom blast zone. Fighters cannot go under the stage. Above the ground are six blocks; Three Brick Blocks and three Question Blocks. All three Brick Blocks and two Question Blocks make up a five-block row at the center of the stage, with the final Question Block suspended above the row. All blocks serve as "hard" platforms which cannot be passed through.

Hazards

 * Block Hitting: With this hazard on, hitting a block from below will cause it to slightly rise in the air before coming back down. Fighters who are standing on a hit block will be dealt slight damage and launched upwards a short distance.
 * Question Blocks: With this hazard on, hitting a Question Block from below will cause it to dispense any enabled item, after which the block turns into a Hard Block and cannot be hit again for another minute (after which it will return to being a Question Block).
 * Lifts: With this hazard on, a Lift will appear on each side of the stage on occassion, rising from the bottom and up into the top blast zone.

Alt. Skin: World 1-2
By holding the L button when selecting World 1-1, it gains a new color palette based on World 1-2 from Super Mario Bros., being the first underground stage in the game. While not as iconic as World 1-1, the level has been featured in various Mario games, such as Super Mario Bros. 3, Super Paper Mario, and Super Smash Bros. Brawl. The level is also notable for being the access point for the "Minus World" glitch, one of the most infamous glitches in gaming history.

The World 1-2 skin causes the ground and Brick Blocks to gain a blue hue, while Question Blocks remain their original color. The background also turns completely black.

Trivia

 * Early versions of the stage included two pipes on each side of the stage, but they were removed for unknown reasons.
 * The Super Smash Bros. Ultimate version of the Super Mario Bros. 2 ground theme was originally planned to appear as a song on the stage, but was scrapped for unknown reasons.