10th Prestige Lobby

A game in Modern Warfare 2, Call of Duty 4, or Call of Duty 5 in which the player can reach the very last prestige in the game, 10th prestige. When in the lobby, if you get a kill, instead of the display saying "+10" or "+50" it says "+1.986E+0.006". In this lobby, you can also unlock challenges, camoflauges, and the hidden spinning skull emblem. You normally have to pay $10 (7 UK pounds) to get in, but some are also free...