Sure thing!
Basically, for each level, you start in the lower-left corner and have to make your way to the door in the upper right. All levels are one screen, and you have to ascend from the ground level to the third level, usually by climbing ladders.
Touching any enemy will send you back to the beginning of the level.
You use the d-pad to move left/right, or up/down on ladders, and the A button to jump.
The game ends after touching the door on the 25th level.