I'm not sure if this has been posted before. I searched and searched but I didn't find anything.
In Wii sports, go to training. Then play "power bowling" (you have to play the first bowling training first) When you bowl in power bowling, It adds a row after each frame. While bowling, in the very back of the pins (far left or right) you can notice a small red button. When you hit this button, EVERY single pin will fall down. You can only do this at the end, because the barriers are the widest. To hit the button, you have to roll the ball on top of the barrier, and you will here a click, this means you've hit the button, and every pin will fall down. This is very helpful, because this will add about 150 some pins to your score. I have only got it a few times, but it isn't extremely difficult.
Let me know if you've gotten this before, or at least noticed the button. Once again I'm sorry if this has been posted before.