The first official map pack for Call of Duty: World at War has now gone Live on Xbox Live Marketplace.
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The map pack has three new maps and a new Nazi Zombies map... but some people have had trouble trying to play it.
If you've downloaded the map pack but can't get World at War to recognise it, head to Device Options under Memory in System Settings back on the dashboard. Then press X, X, Left Bumper, Right Bumper, X, X to clear the cache on your HDD. When you reboot the game, it will prompt you to download an update and the maps should work after that!