OnLive announced today that it has brought its free app from the Android Market to Sony’s Ericsson Xperia PLAY smartphone, which allows the device to play most of the service’s available games.

The Ericsson Xperia PLAY is an Android-based smartphone that includes a touchscreen control and a slide-out gaming keypad with touch joysticks and shoulder buttons.

The just-updated free OnLive Android App delivers AAA titles that were previously unavailable with slide-out controls.

“From the moment we launched our OnLive Android app, gamers began asking about Sony Ericsson Xperia PLAY game control support,” said Steve Perlman, OnLive Founder and CEO. “We listened and delivered. Now Xperia PLAY gamers in the US and UK can play almost all of OnLive’s 200 premium titles—including hit AAA games like Saints Row: The Third and Assassin’s Creed: Revelations—on their Xperia PLAY smartphone with a full console-class experience, including multiplayer and social features.”

With OnLive, gamers can play a game on a PC or Mac and then pick up where they left off via the OnLive Game System or with a smartphone and and the OnLive app.

Tablet and smartphone owners who don’t own an Xperia PLAY can also use OnLive to play games that have been redesigned to use touch controls or virtual gamepads, as well as with the Universal OnLive Wireless Control that’s designed for smartphones, PCs, Macs, TVs and Blu-ray players.