World 4-2 (Super Mario Bros. 3)
From the Super Mario Wiki, the Mario encyclopedia
The platforms in this level are continuously moving up and down, and a Cheep-Cheep flies out of the water below. The player also encounters several other enemies like Piranhacus Giganticuses and Giant Koopas. To collect the power-up in the Mega ? Block, the player must kick an Ice Block into it. After two giant pipes and a bridge, if the player is powered-up, they can break the Brick Block underneath the ? Block to get a Starman, otherwise they will have to use a Switch Block nearby. In the same area, several Cheep-Cheeps will begin jumping out of the water to attack the player. Entering the Warp Pipe at the end takes the player to the goal.