Contradiction tests your ability to lie and remember your lies! You will be given questions and a range of possible answers. Be sure you answer the question before the time runs out! Remember, there is no correct answer until you choose one.
When a question is repeated and you give the same answer as before, you earn points. If you give a different answer, the game ends.
There are "PowerUp" buttons at the bottom of the gameplay screen to let you narrow the selection of answers, skip a question, or get more time. You "spend" points to do this.
For real money, you can buy points via In-App Purchase.