Army Defender is an action shooter in which the player must defend his base against enemy attacks by controlling a machine gun tower designed to eradicate enemy waves. As the player levels up, the enemy becomes more and more numerous and well-equipped. Attackers include soldiers, tanks, paratroopers, helicopters, jet fighters, bombers, elite commandos... Depending on the enemy type (red and green), the player must switch between ammunition colors. The machine gun tower will fire where the player taps the Touch Screen. Power-ups are made available on a regular basis, when a super bomber delivers them onto the base. When a power-up is retrieved, the player will be able to upgrade his tower during a limited amount of time. Upgrades include flame-throwers, rocket launchers or concussion grenades that will help contain enemy progression.