VIDEOS:
Donkey Kong Plus
The Final Boss of the first game is a Humongous Mecha piloted by Donkey Kong, which you defeat by chucking barrels at the cockpit to break it.
Example of:
In Case of Boss Fight, Break Glass
Megaleg
Example of:
In Case of Boss Fight, Break Glass
Digga-Leg
Example of:
In Case of Boss Fight, Break Glass
Megahammer
Example of:
In Case of Boss Fight, Break Glass