Valve completed its weeklong trilogy of announcements Friday, revealing the Steam Controller that's intended to "bridge the gap from the desk to the living room."
The dual-trackpad controller with a touchscreen in the center — which is capatible with older, current and upcoming games on all versions of Steam — piggybacks on the Valve's two previous announcements this week. The company revealed SteamOS, a Linux-based operating system that allows Windows and Mac games to be stream streamed from a computer to a TV; and Steam Machines, Valve's hardware for living room gaming.
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"We've fooled those older games into thinking they're being played with a keyboard and mouse," Valve said in its announcement.
"Whole genres of games that were previously only playable with a keyboard and mouse are now accessible from the sofa," Valve added. "In addition, games like first-person shooters that are designed around precise aiming within a large visual field now benefit from the trackpads’ high resolution and absolute position control."
The symmetrical controller has 16 buttons. Valve emphasized that its touchscreen is designed to let players keep their attention on the TV screen. When they're using the touchscreen, it appears as an overlay on top of the game on the TV screen.

The controller has a "legacy mode" that converts it into keyboard-and-mouse mode so gamers "can use the configuration tool to create and share bindings for their favorite games" and then "choose from a list of the most popular configurations."
The controller, for now, is available in beta as part of the Steam Box beta pool, which players can sign up for by Oct. 25.
BONUS: The 10 Most Beautiful Mobile Games
You know that nightmare where you're running through the woods, being chased by some unseen terror? That's pretty much Dead Runner. The hauntingly beautiful landscape provides the perfect backdrop.
Price: $0.99 for iOS and Android.
Meet Quozzle, an incredipede -- basically an eyeball that can grow various forms of limbs -- who's on a quest to save her sisters. While the premise is bizarre, the illustrations are beautiful. Inspired by medieval woodcuts and 1700s botany texts from the Age of Discovery, the game is so beautiful it'll be hard to tear your eyes away.
Price: $3.99 for iOS and Android.
Another console game-turned-mobile, Limbo has long been hailed as a gaming work of art, and pioneered the popular style of black silhouettes with light or colored backgrounds. The game is at the same time creepy and beautiful, with unexpected enemies lurking around every corner, waiting to bring about gruesome deaths.
Price: $4.99 for iOS.
Machinarium is a point-and-click adventure game that follows an exiled robot named Josef, who is attempting to return to the city of Machinarium to rescue his robot beloved (who was kidnapped by a mafia-esque organization called the Black Cap Brotherhood). To do so, Josef has to solve a series of puzzles. But the real beauty of the game is the detail in the hand-drawn illustrations.
Price: $4.99 for iOS and $5 for Android
Reminiscent of Limbo, this physics-based game shows the landscape as a black silhouette against a stunning panorama of the night sky.
Price: $0.99 for iOS and $4.99 for Android.
The premise of Osmos is simple: You're a galactic mote. Eat smaller organisms to grow and thrive, and watch out for larger organisms that are trying to eat you. What makes this game special is the beautiful colors.
Price: $0.99 for iOS and $2.99 for Android.
A pixelated world sounds like a gaming nightmare, but Sword and Sorcery masterfully sets this heroic fantasy in a beautifully antiquated world.
Price: $4.99 for iOS and Android.
Based on the graphic novels that inspired the record-breaking television series, The Walking Dead surrounds a new group of characters in the same zombie-infested world. While the game is already unique for its focus on story and characterization rather than puzzles and shooting, the comic-like illustrations pay homage to the series' roots in a gorgeous way.
Price: Free to download for iOS; each episode is $4.99.
This physics-based construction game is as addictive as it is beautifully simple. Create structures by connecting balls of goo to get you from point A to point B.
Price: $4.99 for iOS and $2.99 for Android.
This Swedish game, which is based on an old man's walk though the woods to search for omens for the coming year, is one of the most creatively original games we've played on mobile. Year Walk may be a little trippy, and it may freak us out just a tad, and we may not even fully understand it, but boy, is it friggin' pretty.
Price: $3 for iOS.
Image: Valve