November 24, 2008 - Tower Defense in itself has become a casual game genre. Whether it's any number of clones on portals like Kongregation or Pixel Junk Monsters on the PlayStation 3, the basic formula is always the same: create a gauntlet that reduces enemies to hamburger. Fieldrunners for the iPhone does not stray from the essentials but dresses them up with great production values, such as attractive cartoon graphics. Plus, the game has been recently updated to include new content, such as an additional map and sound effects.