Level 6-4 (Mario vs. Donkey Kong)
In the first area, the player has to crouch under a platform while riding a conveyor belt. The player then has to swing and jump from a wire to reach a moving lift, and then jump to the right. After crossing between alternating lasers, the player then has to use another wire to reach a platform above and then collect the Key. Dropping down to the left, the player has to move through the lasers once more, and then fall into a passage to the right while avoiding more lasers. As soon as the player lands on the conveyor, the player has to drop the Key and crouch under a wall, then immediately pick the Key back up once on the other side and jump to the locked door.
In the second area, the player has to press a blue Color Switch and then climb up a rope to reach a line of Robokikkis. While swinging across their tails, the player needs to offset their movement enough that the player can get under the wall and some spikes above after climbing a ladder. After crossing the line of Robokikkis, the player has to ride conveyors to Springboards that will lead to a red Color Switch. The player needs to press this Color Switch when the Katakata Spanner Heihō is on the blue platform. The player then needs to climb onto a Robokikki's tail, collecting a 1-Up Mushroom in the process, and drop onto the Katakata Spanner Heihō when it is below them. Riding the Katakata Spanner Heihō across the spikes and crouching to avoid spikes on the ceiling, the player can then collect the Mini-Mario.