Sony Ericsson also unveiled two other smartphone models running Google's Android software and said it plans to launch at least eight Android phones this year.
"The Xperia Play offers something refreshingly different amidst a sea of homogenous Android devices. Sony Ericsson needs to maximise its first-to-market advantage before the inevitable rush to join the PlayStation party," said Geoff Blaber, analyst at research firm CCS Insight.
Bert Nordberg, Chief Executive of Sony Ericsson, told Reuters the firm will focus increasingly on growth this year, after turning profitable in 2010.
Nordberg said the company aims to grow both revenue and profits in 2011.
All new models will go on sale from early April, leaving the group with an awkward gap having already had to slash prices to attract Christmas shoppers to its ageing handsets.