A Game Score leaderboard is a collection of scores achieved in a game that are available for viewing by a player. Leaderboards allow players to measure their level of talent in a game as well as compare their talent to other players.
Leaderboards can be measured in various ways. The format of a leaderboard is at the discretion of the game's developer. Most games incorporate a "Friends Leaderboard" that allows players to compare their statistics with people on their friend's list. This type of leaderboard promotes healthy competition between friends that may not exist between unfamiliar people. Popular games like Call of Duty reward players with exclusive content and bonuses for achieving certain goals on the leaderboards.