Angry Birds version 1.5.3 for iOS has landed in the Apple's App Store. In this update the Birds conclude their adventures in the Frontier Badlands with 15 new levels 'each more challenging than the next.' And, there's also a new Golden Egg, and it's apparently 'good, band and ugly' all in one deliciously difficult to obtain challenge.
Also note, that Rovio has now included some promotional material for other Angry Birds-associated content on the pause screen (screen shot after the break) has angered some.
"The survival of the Angry Birds is at stake. Dish out revenge on the green pigs who stole the Birds' eggs. Use the unique destructive powers of the Angry Birds to lay waste to the pigs' fortified castles. Angry Birds features hours of gameplay, challenging physics-based castle demolition, and lots of replay value. Each of the 240 levels requires logic, skill, and brute force to crush the enemy."
Download From: iTunes Apps Store