Call of Duty 2, the Xbox 360's highest selling game, has a bug that could render your saved games corrupted and unplayable. For a gamer who has just slogged his way through 10 hours of WWII battlefields, this is a big problem. IGN contacted Activision and luckily, there is a solution: cheat.
From the Mission Selection screen, hit "Select and HOLD both shoulder buttons and simultaneously hit D-pad left, left, right, right, Button Y, Y." This will allow you to select any level. There is another solution involving loading your profile before starting the game, although IGN found this method sketchy. Activision is working on a permanent fix.