Fieldrunners offers three types of 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. Extended mode adds the two new towers, Flame Tower and Mortar Tower. In Endless mode, the player may defend indefinitely. In any mode, the player may play in Easy, Medium, or Hard mode.