The couple chose one of two categories and took turns answering a series of questions, using one of three response choices. The clock began to run when the first question was asked; if the couple gave the required number of correct answers, the clock stopped and they chose a new category to play the next higher level.
The couple selected one of two categories and took turns answering a series of questions with three response options. The timer began when the first question was asked; if they answered correctly enough, the clock would stop, and they'd move on to the next category at a higher level.