World 3-7 (Super Mario Bros. 3)
From the Super Mario Wiki, the Mario encyclopedia
The player starts on a column made of Wood Blocks, one of them with a power-up, and a ? Block above. There is also a Spike walking towards Mario, and next are two more Spikes, followed by a 5x3 rectangle of Brick Blocks, in which one contains a 1-Up Mushroom. After this, there are more Spikes, alongside some Koopa Troopas. There is a Wood Block with another power-up and some Brick Blocks after this and, if players have at least a Super Mushroom, they can reveal a Beanstalk, leading to an area with two paths.
The left path leads to some clouds with coins, and a Switch Block inside a Brick Block at the edge. The right path leads to a platform made of clouds with a hidden Magic Note Block that sends the player to a Coin Heaven with a chest containing a Jugem's Cloud at the end. After the Beanstalk, there is a Venus Fire Trap, followed by more Spikes, another Wood Block with a power-up, a Koopa Paratroopa and the goal.