Y-turn

When I am going to perform something in great numbers, I decide a turn. You may decide a turn by rock- paper-scissors, but do not decide a turn with iPhone(iPod touch)? A number assigned at random becomes your turn. Of course the numerical value that appeared never appears once. Even bingo is usable. I am all right without a number ball. [Hit/miss] and [lottery] are on, too. In addition, you devise how to use, and please use it in every scene.