The second game in the Infinity Blade series is currently free, so if for some odd reason you still don't own it you've pretty much run out of excuses.
Infinity Blade II follows Siris as he attempts to free The Worker of Secrets and, hopefully, save the world. It also introduced players to two new weapon styles (dual wielding and two-handed), ClashMobs, and a more cohesive plot (see previous).
Really there's no reason not to grab Infinity Blade II now while it's free. I guess not unless you already own it, anyway.