When facing enemies, the player can either use melee and combo attacks at close range to take out foes or can opt to use weapons. Melee attacks comprise a variety of single punches, while combo attacks are activated through specific sequences of button presses that, when timed correctly, offer much greater damage; the most damaging of these is the specific "brutal combo", which forces enemies to drop twice the ammunition they would normally leave. Nate can only carry one pistol and one rifle at a time, and there is a limited amount of ammunition per gun. Picking up a different firearm switches that weapon for the new one. Grenades are also available at certain points, and the height of the aiming arc is adjusted by tilting the Sixaxis controller up or down. These third-person perspective elements were compared by several reviewers to Gears of War, in that the player can have Drake take cover behind walls, and use either blind fire or aimed fire to kill enemies. In common with the aforementioned game, Uncharted lacks an actual on-screen health bar; instead, when the player takes damage, the graphics begin to lose color. While resting or taking cover for a brief period, Drake's health level, indicated by the screen color, returns to normal.