Level 1-4 (Mario vs. Donkey Kong)
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The player starts next to the locked door and a ladder. After climbing the ladder, the player can either use the Springboards ahead or a Handstand Jump to reach the Key. Once the Key has been grabbed, the player needs to fall to the bottom Conveyor Belt, throw the Key onto it, crouch to get under the platform, and then pick the Key up again on the other side before its timer runs out. The player can then unlock the door to the next area.
In the second area, the player needs to climb a ladder and grab onto the Wire above, avoiding the Sparky. By swinging underneath the 1-Up Mushroom and launching after spinning enough times, the player can direct their decent onto the Conveyor Belt above. By crouching to get under the platform, then performing a Handstand Jump or using the below Wire to reach the above Conveyor Belts, the player can reach the Mini Mario.