There's some good news for fans of Rovio's super popular Angry Birds franchise, with many titles being available for free right now on Windows Phone, Neowin reports.

There's no official info about this, so right now this seems to be a Store error rather than an actual promotion but many Angry Birds games are free at the moment, Neowin says. This includes the new Angry Birds Star Wars 2, Angry Birds Rio, Angry Birds Star Wars 1 and the original game.

So far users from all over the world are reporting this is happening but depending on the location. For example some users aren't seeing Rio as being free, while others are able to download the Space version without paying. Finally there are some that say even Amazing Alex, another Rovio title, is currently free in certain locations.