Goal Door (Mario vs. Donkey Kong series)

Goal Doors (also known as M Doors, exit doors, or generically as the goal,, the exit, or the door ) are the main objective in most non-boss levels in the Mario vs. Donkey Kong series. Minis must enter these doors to complete the level.

Mario vs. Donkey Kong 2: March of the Minis
Goal Doors debut in Mario vs. Donkey Kong 2: March of the Minis, where they are generically referred to as the goal or the exit and appear as curved, yellow-colored jambs with an "M" symbol imprinted on them. In this game, the objective of each level is to guide at least one Mini into the goal. When a Mini enters the goal, it sparkles. If multiple Minis consecutively enter the goal while it is still sparkling, a Chain Goal bonus is activated, adding to the level's score. The level will only end when all Minis in the level have either reached the goal or have been destroyed; however, if every Mini in the level is destroyed, the game is over.

Mario vs. Donkey Kong: Minis March Again!
Goal Doors return with the same function in Mario vs. Donkey Kong: Minis March Again!. In this game, the "M" symbol on the jamb is absent, and the door has a thin, hot pink border around the inside.

Mario vs. Donkey Kong: Mini-Land Mayhem!
Goal Doors appear in Mario vs. Donkey Kong: Mini-Land Mayhem! with a different function than in previous games. In levels with only a single Goal Door, the door is red with a golden border. When a Mini enters the Goal Door, a timer appears on the inside of the door and begins counting down. If this timer runs out before all the Minis in the level reach the Goal Door, the door will close and the game is over. The timer resets if another Mini reaches the Goal Door. Additionally, every Mini must reach the Goal Door to complete the level; if a single Mini is destroyed, the game is over.

Mario vs. Donkey Kong: Mini-Land Mayhem! also features Multi-Door levels, where each Goal Door is assigned to only one of the playable characters — Mini Mario, Mini Toad, Mini Peach, Mini Donkey Kong, or Mini Pauline. They are colored red, blue, pink, yellow, or sea-green, in respect to each character. Each Mini must be brought to its respective Goal Door. Goal Doors assigned to characters do not have a timer.

Mario vs. Donkey Kong: Tipping Stars
Both regular and assigned Goal Doors reappear with the same functions in Mario vs. Donkey Kong: Tipping Stars, along with a green door assigned to Mini Luigi. In this game, the criterion that all Minis in a level must reach the Goal Door consecutively to one another is known as the Chain Rule.

Mini Mario & Friends: amiibo Challenge
Goal Doors reappear in Mini Mario & Friends: amiibo Challenge. In this game, the "M" symbol on the front of the door is replaced with a red flag. Variants of Goal Doors known as amiibo Doors also appear.