Gameplay of Dark Sector revolves around the use of the Glaive, a tri-blade throwing weapon similar to a boomerang which returns to Hayden after each throw. The Glaive can be used for long-distance combat, solving environmental puzzles, and picking up in-game items. When in close proximity to an enemy, context-sensitive actions may appear, allowing the player to execute enemies with "finishers". Enemies hold onto Hayden while attacking, and the player must rapidly press a randomly prompted button to break free.
Environmental puzzles in the game usually focus upon capturing various elements (fire, electricity, or ice) with the Glaive. For example, a web blocking Hayden's path can be bypassed by capturing fire with the Glaive, and then launching it at the web to burn it down. The Glaive can also be dual-wielded with a gun, which allows the player to perform weapon combos which are more effective against shielded enemies. As the game progresses, Hayden and the Glaive are given several new abilities; it can be guided through the air, being able to kill multiple enemies; a charged-up throw for deadlier attacks; and the ability to make Hayden invisible for a short time and provide a temporary shield.[3]
The camera is positioned over the shoulder for third-person shooting, and the player can take cover by standing next to an object such as a pillar or wall. While in cover, Hayden can move temporarily out of cover to fire and throw the Glaive, but there is no blind firing from behind cover. There is a sprint function, which works similar to Gears of War's Roadie Run,[4] and melee attacks that allow Hayden to punch or slice nearby enemies. The game has no HUD (except for the ammo counter); Hayden's health is shown by the screen flashing red when he takes damage, as well as an indicator showing the attacker's position. If Hayden takes too much damage, the flash speed will increase, and a heartbeat will be heard, indicating Hayden is "bleeding out".
Money, ammo, weapon upgrades, and grenades can be found in set locations. Downed enemies drop their guns, though after his infection, Hayden can only carry these weapons for a few seconds before they self-destruct. Permanent weapons can be purchased and upgraded in black markets,[5] one small weapon for his off-hand use with the Glaive (replacing the pistol) and one large weapon such as a shotgun or rifle.
