Leader boards are lists of the top performers in a competition or activity. They show who is leading or doing the best in that particular activity, like a ranking system. Full definition
The point system makes the game highly addicting because of leader boards. (darkstation.com)
You'll also get points for style, technical skill among other things where, should you do good, your scores will be displayed on the online leader boards for all to see. (droidgamers.com)
Players can see what rank they are on the global leader board for each level. (x35earthwalker.com)