The tower defense genre has been around for years, punctuated every so often by the release of a game that sets a new standard for how things should be. One of the first for the browser world was Desktop Tower Defense, and for the mobile market, an early heavy-hitter was the original Fieldrunners. Developer Subatomic Studios took a few years to do it, but the team has finally rolled out a worthy sequel with Fieldrunners 2. Expect more maps, more variety, more units, more enemies, and more rewards with this stunning release that will rewrite the way you think of the tower defense genre on iPhone.