Infinity Blade 2 has received a large, free content update today, and is on sale at a cheaper price to boot. The "ClashMob" update creates social challenges, along with new in-game items, and the Gem Forge feature. Unfortunately, it doesn't include synchronized crowd dancing -- you're thinking "FlashMob."

The social features allow you to take on new challenges and recruit your friends to "MyMob," for special perks and rewards. Plus, the free update packs 24 new weapons, rings, gems, and equipment. It also updates support for iOS 5.1, and optimizes for the new higher-resolution iPad. For a limited (but unspecified) time, the game is marked down to $4.99 instead of its usual asking price of $6.99.

"We're super excited to launch ClashMob and introduce Infinity Blade II fans to an innovative new mode of play that taps into the unique and social nature of today's mobile devices," said Chair creative director Donald Mustard, in the announcement. "Massively multi-player gaming is something that resonates deeply with our audience and we feel the ability to now deliver this type of gaming experience, asynchronously on a mobile device is a real game changer."