When full modding tools and Steam Workshop integration launch, the game will rival any click-and-loot game out there.

FORBES: Connect

But if Valve wants to launch Steam Box with an initially exclusive title to draw users to the platform, the Half Life games are the biggest guns in their closet.

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The War Z has been a very controversial game, even before its disastrous launch on Steam earlier this year.

FORBES: 'War Z' Producer Sergey Titov On Losing Steam, 'Day Z' Comparisons

As for whether or not Half Life 3 could be a launch title for the Steam Box, Newell was mum.

FORBES: Valve's Steam Box Might Be Moving Faster than We Thought

Big Picture furnishes users with a snazzy start-up animation the second it's activated, flourishing its launch by superimposing the Steam logo over pixelated bubbles and liquid sound effects.

ENGADGET: Steam Big Picture beta hands-on HD

To celebrate the launch, all Software titles on Steam will be available for 10% off their regular price throughout the week.

ENGADGET: First non-game titles now available on Steam, game dev tools lead the charge