Press space to bowl Left and right to move the ball Since there's no way to get a strike, you can get a spare! The spare doubles your pins that you knocked down in the current frame meaning you earn a total of 20 pins. You can get a maximum of 200 pins!
Thanks to google for the bowling pin image. I just shrunk and cropped the image. Thanks to scratch for the "pop" sound when the bowling pins get knocked down. Everyone's bowling game looked bad so I tried to make one myself. Turned out pretty well.