Instructions
Move your character to the side of the lane that matches your throwing hand. For example, if you are right-handed, move to the right side of the lane. You'll want to be in a position where your ball would roll right along the gutter.
Press the A button, and tilt your character until the dotted line that the represents the ball's trajectory is half on the pin in front, and half on the pin next to it.
Throw a straight ball. If the ball is fast enough, it will knock all of the pins down, giving you a strike. You may need to practice these steps multiple times before you can throw a straight ball that is fast enough.
Bowl nine strikes for the first nine frames, then bowl three more strikes in the tenth frame in order to score 300 points.