Subatomic Studios

Fieldrunners offers three types of tower defense gameplay: Classic, Extended and Endless. Playing in Classic and Extended modes limits the number of rounds in which the player must defend to 100. Classic only lets players build the original four towers, Gatling, Goo, Missile, and Tesla (except Skyway which substitutes Laser for Tesla and Frostbite which substitutes Ice for Goo). Extended mode adds the two new towers, Flame Tower and Mortar Tower (except Skyway which adds Tesla instead of Mortar). In Endless mode, the player may defend indefinitely.