The quiz may be fiendishly difficult, but the rules couldn't be simpler.

• To take part in the quiz, you need to answer as many questions as you can from our database of 100 challenging brainteasers. You can find all the answers somewhere in the pages of Channel 4 History.

• Each time you answer a question correctly, you’re awarded one point.

• You get three lives each time you do the quiz. When you answer a question incorrectly, you lose one life.