Urgent help

I have a movie in the main timeline that has 3 movies inside with 3 buttons to play them.
I Want to force the user to click in the 3 movies before they jump to a diferent frame in the main timeline.
I want to force the user to discover the 3 movies, once they play them they will be redirected to a frame in the main timeline
If someone could helpe me, with some detail, i would be very thank full

;(