Elfster, a free online Secret Santa organizer and social networking platform, has launched a Christmas surprise within Google Chrome. Users of the Elfster App for Chrome can use a code fragment secretly hidden inside to unlock one of three special Angry Bird holiday levels. Those that haven't already grabbed Elfster can do so via the official website or on the Google Chrome store.

"Elfster has always been a whimsical-yet-functional app, so we're thrilled to be connecting witha fellow fun-filled phenomenon like Angry Birds!" said Peter Imburg,CEO at Elfster. "We're excited to be partnering with Google for the holidays and look forward to seeing our fans enjoy the secret AngryBirds holiday level you can only unlock by using Elfster's ChromeApp."

Users who are seeking the code fragments can check for hints on the Elfster Facebook, or follow the hashtag #bonuslevelhinton Twitter for additional ideas on where to find their special Angry Birds gift this holiday season.

You can find Angry Birds on Chrome here .