 The corresponding Xbox 360 update arrived several weeks later.The first downloadable content was announced in November the same year, along with news of an expansion, in the form of a "Challenge Pack", which was to add seven new maps and two modes to the multiplayer feature, an offline split screen version and a "Legendary" difficulty for single player, with corresponding Achievement Points for the 360 version.These new modes were made available on 15 February 2008 for the PC and Xbox Live for the 360, the split-screen option for free.