I just had to add this to the library here because we just did the game as an icebreaker in one of our youth group meetings. It is very simple.
Every person must come up with two truths and one lie about themselves. You will go around one by one and have each person share their three things in any order. After they say their three things, you can have everyone vote on which one they believe is the lie. After everyone has voted, the person shares the correct answer.
The goal of this icebreaker is to learn more about each other. So feel free to ask follow-up questions about any of the three allowing the youth to share more about themselves with the others.