In Donkey Kong, you play as Mario and have to get up the ladders to save the girl.
On the first level, Mario has to use stairs and slanted girders to get to the top. Donkey Kong throws barrels at you to get you to stay away. You can either jump over the barrels or hit them with the magic hammer to get a few extra points. On Level 2, you have to deal with lifts (don't fall off), and on Level 3, you have to unbolt girders to make Donkey Kong fall. In this popular arcade game, you have to run and jump to stay alive and try to get the highest score.
Have fun and good luck!