The developers of record-breaking mobile game app Angry Birds have announced there will be a free upgrade available for the app over the Christmas season.
Rovio made the announcement on the social networking website Twitter that there will be extra levels available for free this festive season.
The extra levels will upgrade the Halloween levels that were recently released to iPhone and Android handset owners alike.
According to Techland, the Angry Birds Christmas will provide the user with Santa hat-wearing pigs to fire your supply of birds at, with a backdrop of a winter wonderland.
