(C) 2008 Valve Corporation. All rights reserved. Valve, the Valve log o, Left 4 Dead, Source, and the Source logo are trademarks or registe red trademarks of Valve Corporation in the United States and / or oth er countries.

(C) 2009 Valve Corporation. All rights reserved. Valve, the Valve logo, Left 4 Dead, the Left 4 Dead logo, Source, the Source logo, Half-Life, Counter-Strike, Portal and Team Fortress are trademarks or registered trademarks of Valve Corporation in the United States and/or other countries.