On our June trip, we did WWTBAM and this is how it went for us. Everyone is seated on a first come basis, so those in line first will be seated in the first row seats (on the stage floor where contestants are chosen from on the TV version of the game.) After all those entering the attraction are seated, they went over some rules and such prior to beginning the "taping". Once the host came out and the game actually started, the first question was placed on the screen and you punched in your answer...the one with the correct answer and the fastest time was chosen to sit in the hot seat. As that person answered questions those in every seat of the audience answered along and the top 10 scores were shown periodically. When that individual answered all and won, or answered incorrectly and was removed from the hot seat, the person who then had the most correct answers AND was the fastest time became the next contestant in the hot seat. While we were there, we actually had 2 people make it to the hot seat and I assume this is the norm for the time period in which they play the game before ending.
Actually, none of us made it to the hot seat, but DH made it to the #8 spot on the top ten list during the first game and I made it to the #5 spot during the second game. We had a blast and plan to go back a few times on our Christmas trip.