Level 4-2 (Mario vs. Donkey Kong)
The level opens with a cinematic showing Mario stepping on a blue Color Switch to make a Key fall onto the conveyor belt, then jumping onto the red Color Switch to remove the blue wall so the Key can reach Mario.
In the first area, the player starts next to a Springboard they can use to reach the platform with the locked door on it. Then, the player needs to climb across ropes to reach the platform on the right. Jumping down to the right, the player needs to press the blue Color Switch and then throw the Key onto the conveyor. Once the key is past the red wall's outline, the player needs to press the red Color Switch to remove the blue wall. Once the key is past the blue wall's outline, the player needs to press the blue Color Switch again and use the ropes to get over the blue wall and reach the Key before its timer runs out. With the Key in hand, the player can use the Springboard again to reach the locked door.
In the second area, the player needs to use a Springboard to reach a platform with a Sir Shovalot on it. While crouching, the Sir Shovalot will push the player through the small opening in the wall, which will cause them to fall into an area with another Sir Shovalot. Using this Sir Shovalot as a platform, the player can reach a ladder to reach a platform with another Sir Shovalot. After having the Sir Shovalot push the player past the wall, the player needs to quickly jump across a couple of Donut Blocks before the Sir Shovalot shoves them off the platform. After the Donut Blocks are three Springboards that will lead to three Donut Blocks (with a 1-Up Mushroom over the first) that the player needs to jump across before the Donut Blocks fall into the spikes below. Above the third Donut Block is a Hammer the player can use to defeat the Candles surrounding the Mini-Mario.