Mario's pet gorilla. Donkey Kong is a foul-tempered and stubborn beast, and when he became tired of being Mario's pet, he kidnapped Pauline and climbed up a construction site.
In every level he stands at the top of the screen, taunting Mario. On the 25M stage, he throws barrels down the stage and on the 75M stage, he throws Jacks.
The main obstacle at 25M. Donkey Kong throws them from the top of the stage. They roll down the girders and ladders. Mario has to jump over them or break them with a Hammer to pass them.
If a blue Barrel (marked with a skull on the side) reaches the Oil Drum, it will turn into a Fireball. The blue Barrel doesn't appear in all ports of the game.
On the 25M stage, the Oil Drum sits behind Mario. If a blue Barrel hits it, it spits out a Fireball. On the 50M stage, an Oil Drum sits in the center of the conveyor belts and collects the Pies.
A wandering little Fireball that appears at 25M, 50M and 75M. It will wander across the girders and climb ladders. If Mario touches it, he loses a life.
The main obstacle on the 50M stage. Pies are carried around on the conveyor belts and Mario has to jump over them.
The main obstacle on the 75M stage. Jacks bounce along the top of the screen and then drop down between the platforms Mario has to climb.
A different kind of Fireball that appears on the 100M stage. They move much faster than the first kind, and up to 5 of them can appear on the stage at one time.