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The 1% Club is a TV game show, with UK, Australian and US versions, and possibly other countries as well.
An group of 100 contestants in the studio are each given an amount of $1000 in Aus, and £1000 in the UK. They face a series of quiz questions which have been checked against a test group of 1000 people, which identifies the difficulty of the question.
If 90% of the 1000 get it right, it is called the 90% question, and is fairly simple. If a contestant gets it wrong, they are eliminated from the game, and their $1000 goes into a prize pot. If 80% of the 1000 get it right, it becomes the 80% question. The same goes for the 75%, 70%, 60% and so on till they reach a question only 1% of the 1000 test group can answer correctly. Contestants get 30 seconds to solve the question while the host rambles on with distracting chatter.
Contestants are eliminated at each level and their stake is added to the prize pot. Anyone not eliminated when they reach the 1% question can take $10,000 or risk it to attempt the 1% question, where they could win (or share if more than 1 get that far) the total of the prize pot, which could have risen to $100,000.
The hosts, or question masters, are Jim Jeffries in Australia, Lee Mack in the UK and Patton Oswalt in the US.