World 1-2 (Super Mario Bros.)

World 1-2 is the second level of World 1.

Layout
World 1-2 starts out above ground in a cutscene where Mario uses a Warp Pipe to go underground. There are many Blocks throughout the level including Item Blocks and Brick Blocks. There are 14 Goombas, 3 green Koopa Troopas, 4 Piranha Plants, and 1 red Koopa Troopa. There are several pits and several pipes, one of which is a warp pipe leading further underground. In the room that the pipe leads to, there are several Golden Coins lined up above some brick blocks and a pipe leading back to the main part of the level. Near the end of the main tunnel is one column of platforms constantly going up, another heading down, and another column heading up. If the player doesn't use the platforms to get above the block ceiling but instead heads for the bottom path, he or she will find a Warp Pipe heading above ground. Once there Mario will find a staircase of blocks, a Flagpole, and a fortress that is in the background. If the player did indeed use the platforms to get above the block ceiling and continues to head right, he or she would reach a Warp Zone leading to Worlds 2-1, 3-1, and 4-1. The player can use a glitch to make the Warp Zone also lead to World 5-1 and the Minus World.

Later Appearances
World 1-2 reappears in every remake of Super Mario Bros. A part of Super Paper Mario]] in Super Paper Mario is based off of World 1-2. In Super Smash Bros. Brawl the Mushroomy Kingdom stage sometimes takes place at World 1-2. At other times it takes place at 1-1.