Level 1-3 (Mario vs. Donkey Kong)
From the Super Mario Wiki, the Mario encyclopedia
The player starts under a "Help" box that shows the player how to perform a Wire Spin and jumping off of it. Ahead are some moving platforms the player has to use to reach a yellow Color Switch, which will drop the Trash Cans onto the Spikes below. Using the moving platform once more, the player can reach the Key, and the platform and Trash Cans will allow the player to reach the locked door.
In the second area, the player starts under some Wires they can use to reach a 1-Up Mushroom above. By climbing up the ladder, the player will find three Trash Cans and four Shy Guys. Riding the moving platform up or performing a Handstand Jump will allow the player to reach the Mini-Mario.