World 6-3 (Super Mario Bros.)

World 6-3 is the third level of World 6 in Super Mario Bros. and the twenty-third level overall in said game. In Super Mario Bros. and Super Mario Bros. Deluxe, this level has a monochrome palette (being the palette usually used in castles), but its palette is similar to other grassland levels in Super Mario All-Stars. The only enemies encountered in this level are Bullet Bills that are fired at the player from off screen, and the level consists of several tree platforms and lifts.

Layout
The player starts on a stretch of land before the first platform. After the third platform is a vertically moving lift that can help the player over a tall platform, after which is a jumping board and three horizontally moving lifts, with a ? Block containing a power-up over the final one. Next is a vertically moving lift before two sets of scale lifts. Here, Bullet Bills will begin to appear. After some more platforms is a jumping board the player can use to reach a horizontally moving lift and a scale. Finally, there are four platforms that will fall when the player steps onto them before the flagpole.

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 platform below the third scale lift, and the score to beat is 21000. The Red Coin locations are:
 * On the platform after the first jumping board, below the lifts
 * Beneath the vertically moving lift after the ? Block
 * On the tall platform after the second scale lift
 * On the platform after the second jumping board, below the lift
 * Underneath the final platform

Level map
Mondo 6-3 (Super Mario Bros.)