How bad are the bad piggies? Well, it appears that they’re so bad that they have also invaded the original Angry Birds game.

The bad piggies are, of course, the stars of Bad Piggies, the newest game from Angry Birds creator Rovio. Released just a couple of weeks ago, Bad Piggies turns the spotlight on the infamous bad guys in the Angry Birds games.

In the game, you must help the bad piggies build flying contraptions so they can steal more eggs. Obviously, that’s quite different from having to annihilate them by hurling angry birds at their fortresses.

Unsurprisingly, this being a game rooted in the Angry Birds franchise, Bad Piggies has been a smash hit among players. Which is welcome news for Rovio, whose previous major release, the Casey’s Contraptions remix Amazing Alex, haven’t been performing remarkably well in the App Store charts.

And now Bad Piggies is also making its porcine presence known in the original Angry Birds game.

Angry Birds

“The Bad Piggies don’t just have a new game,” says Rovio, “now they’ve taken over Angry Birds with 15 of the PIGGEST levels ever!”

In the latest version of Angry Birds, there’s a brand new Bad Piggies-themed episode. You’re still required to remove all traces of the thieving swine in each of the 15 new levels in this episode. But this time, the fortresses you need to destroy to that end are inspired by the flying contraptions in Bad Piggies.

In addition to the new Bad Piggies levels, 15 new “stormy” levels are added to the Surf ‘n Turf episode.

Note that both level expansions are currently applied to Angry Birds for iPhone and iPod touch only; Angry Birds HD for iPad is yet to be updated with the same. Also, a bit disappointingly, this update doesn’t bring optimization for the four-inch display of the iPhone 5 and fifth-generation iPod touch.

The newly updated Angry Birds is available in the App Store for $0.99.

Will we also be seeing some “Star Wars”-inspired crossover content in the game following the release of Angry Birds Star Wars next month? Find out we shall …