World 4-2 (Super Mario Bros.)
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Like with other underground levels, the player starts at a cutscene with their character walking into a Warp Pipe, and then drops down into the level. Up ahead are large gaps and narrow platforms the player has to jump across, followed by a Brick Block structure with the final block containing a power-up. Over the ledge are a trio of Little Goombas, and a Coin Block can be found above the left Little Goomba. Beyond the Little Goombas are a collection of ? Blocks, with the middle one on the bottom-right row containing a power-up. After a downward moving lift are invisible blocks that the player can use to reach a beanstalk in the left Brick Block above, which leads to a Warp Zone with pipes leading to Worlds 6, 7, and 8. Past the beanstalk are four pipes with Piranha Plants in them and a Koopa Troopa and Buzzy Beetles between them. One of the blocks after the second pipe contains a Starman, and the third pipe leads to an area with coins. After the fourth pipe are two Koopa Troopas, some stone platforms, and moving lifts with blocks between them, in one of which in the middle row contains a power-up. After the lifts is the exit pipe from the coin area, followed by two more pipes, a Buzzy Beetle walking down a set of stairs, and downward moving lifts. In the first Brick Block afterward is a power-up, and on top of the row of blocks are coins. Using a set of stairs to get over a pipe, the player can reach the Warp Pipe to the end of the level. If the player goes over the exit pipe, they can reach a Warp Zone to World 5.
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 to the left of the pipe before the one leading to the end of the level, and the score to beat is 33000. The Red Coin locations are:
The Warp Zones are also changed and contain Warp Pipes that lead directly to the end of the level.