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"Valve has revealed the first details of the summer Portal 2 DLC hinted at yesterday. Currently referred to as DLC #1, it will feature new puzzle-filled test chambers and a challenge mode that can be played in both single and multiplayer modes. New leaderboards will also be included to record the best times in the new challenge mode. The DLC will be a free download on Xbox 360, PlayStation 3, PC and Mac. Portal 2 released to rave reviews and has been Valve&amp;#039;s fastest selling title since Half-Life 2, topping all system sales charts in the UK its first week. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/gaming/portal/news/a317157/portal-2-dlc-free-adds-new-test-chambers/>