Rovio has updated its popular Angry Birds Space and Angry Birds Space HD apps to fix some "minor issues" and made them free for a limited time. 

For those who live under a rock: the Angry Birds are a colourful gang of birds that go intergalactic in Angry Birds Space to save their eggs from, well, pigs in space. Users have to launch the birds, like they do in previous titles of the Angry Birds franchise, but now they'll also have to navigate through the gravitational pull of planets. The game includes 160 levels, new birds, more power-ups and Game Center integration.

If you're among the few people who don't already own a copy of these space-themed Angry Birds apps, now is the time to grab a free download for the iPhone, iPad, and the iPod touch. Angry Birds Space is normally 99 cents and the HD version is $2.99, and they both have thousands of reviews in Apple's App Store with 4-star ratings.