World 1-2 (Super Mario Bros.)
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World 1-2 is the second course of World 1 in Super Mario Bros. It is the first underground level, and it holds the infamous Warp Zone, which, if done correctly, the player can use to enter Minus World.
Like the previous level, this level has also been recreated in various games, including Super Mario Advance 4: Super Mario Bros. 3, New Super Mario Bros. 2 within the first course of the Gold Classics Pack, Super Paper Mario, and Super Smash Bros. Brawl as an alternate version of Mushroomy Kingdom. It set the precedent for most 2D Super Mario games to have the second level be an underground level.
The player starts the level by falling through a hole in the roof by a pipe. There will be two Goombas and five ? Blocks. The first one contains a Super Mushroom or Fire Flower, the other four ones contain coins. There will be a block tower structure, where there is a Goomba and a Brick Block with 10 coins. Ahead, there will be some Brick Blocks, one of them containing a Super Star and some Coins, with two Koopa Troopas underneath them. The player will reach a place filled with Brick Blocks with a Koopa Troopa and five Goombas. There will also be a Brick Block with a Super Mushroom or Fire Flower and a masked Brick Block with ten Coins. There will be a pit and, after it, a Block platform that allows the player to get a 1-Up Mushroom. The player will find two Goombas and three pipes, all of them containing Piranha Plants. The player can enter in the first Pipe, that will lead them to a room with Coins and a 10-Coin Brick Block. The player can exit the area by a Warp Pipe in the extreme right. This pipe will lead to the third one in the main area. There will be two gaps and, between them, two ground blocks and some Brick Blocks. After that, a small, half-pyramid structure with two Goombas is seen. Ahead, some lifts will be rising and falling; the first one moves down while the right one moves up. Between them is a platform with a Koopa Troopa and some Brick Blocks, with the final Brick Block on the right containing a power-up. The player will reach a Pipe that will lead them to the final area. They can use the lifts to reach a Warp Zone hidden through the roof. From right to left, the first pipe will head to World 2, the second one will lead to World 3, and the third one will lead to World 4. If the player goes through the regular level pipe, they will lead the player to a pipe with a Piranha Plant in an overworld area. There will be a Block half-pyramid that allows the player to jump on the top of the Goal Pole.
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 at the very end of the underground area above the exit pipe, and the score to beat is 38000. The Red Coin locations are:
The Warp Zone area at the end has also been changed, containing several Brick Blocks, a trio of ? Blocks, several coins, and a power-up in a Brick Block before the pipe leading to the flag.