Two players in multiplayer mode are required for this trick. Have player one go to system link and create a game on Call Of Duty 2, then select a level and set the times (30, 45, or 60 minutes) and other parameters. Remain at the screen and do not start the game. Have player two start a different game, such as Perfect Dark Zero or an arcade game (so you don't have to change discs), then have player two invite player one to his game. Have player one accepts the invite, but when prompted to log out, choose "No". You should now be the host of the game and it will be set to the way you want it.