The Think Tank is made up of people from across Australia with various backgrounds and occupations, and who share an interest in quizzing. There are thirteen people in the Think Tank, who make up a panel of eight in each show.
Before the show, the Think Tank answered quiz questions under strict conditions to determine which eight are in the tank that episode, because if a Think Tanker gets the final "Question: Impossible" correct they cannot be in the episode. Three contestants play against each other in five rounds. The phrases, "Shut the gate", "kill the goat" or "dance like a pagan" are sometimes used, similar to the phrase "Lock it in", from rival game showMillionaire Hot Seat, when selecting an answer. Some contestants have accidentally said "Lock it in" by mistake, leading to joking ridicule from the host.
Full Tank
Each contestant gets asked three questions. When a question is asked, each answer given by the Think Tank is displayed, some being correct, some not, with at least one of the options being correct. Contestants must decide which of the options is the correct answer. 15 points are given for each correct answer, with 45 being the maximum total possible.
Pick a Thinker
Each contestant chooses a Think Tank panellist to ask them one of two questions the panellists have written themselves. Each contestant gets three questions and get no help from the Think Tankers. Contestants who answer a question correctly get 25 points.
Two Think Tankers are asked the same question, and each give their answer, only one of which is correct, and explain why they chose their answer. They must try to persuade the contestants that their answer is correct, and contestants then choose option A or option B. Five questions are asked in the round. Contestants with the correct answer are given 50 points. The contestant with the lowest score at the end of the round is eliminated from the game. At the end of this round, the Think Tank no longer know the questions asked by the host.
Head to Head
The remaining two contestants are each asked questions which have not been seen by the Think Tank, in a best-of-five shootout. Contestants can either answer the question themselves, or can select a Think Tanker for assistance. Each contestant has three opportunities to ask a Think Tank panellist, and each panellist can only be chosen once. If a Think Tank panellist is chosen, the contestant has twenty seconds to answer the question before the brain explodes. A question not answered in time counts as a wrong answer. The contestant with the most correct answers continues to the final round. If the scores are tied after five questions, additional questions are asked until one contestant gets a question right, and the other wrong. During the tie-breaker, contestants cannot ask a Think Tank panellist, even if all three chances to ask them have not been used. The tie-breaker is usually a numerical question and the contestant with the nearest answer wins.
Question: Impossible
The remaining contestant is asked a question that none of the Think Tankers were able to answer correctly before the show. To help to steer the contestant away from incorrect answers, the incorrect answers given by the Think Tank before the show, are displayed. If the contestant answers the question correctly, they receive the Think Tank trophy.
