Gamerscore

A Gamerscore is an award given in a numerical value shown on a player's gamertag. Players attain Gamerscore after completing special tasks or milestones in a game, otherwise known as achievements. In some games, gaining a certain amount of Gamerscore unlocks something in the game, such as armor or new weapons, or gaining a certain number of Gamerscore can also gain achievements in some games. While most games have 1000 Gamerscore in total, some games (eg. Xbox Live Arcade games) have far less than 1000 Gamerscore. Also, some games are not shipped with 1000 Gamerscore, but offer achievements as downloadable content. The total amount of Gamerscore is called the "Gamerscore" by most people. Normally a game has 1000 Gamerscore but if an expansion pack is released more can be added on. The Halo 3 Armor Permutation Security can only be unlocked by collecting 1000 Gamerscore.