The darkness guns are held one in each hand, the one on the right being a small minigun, and the other is a sort 'one hand cannon' that fires immensely powerful rounds. Over the course of the game, Estacado also comes into possession of the 'darkness guns' that are more powerful than many conventional weapons but consume some amount of darkness energy in order to fire. The Darkness powers include summoning different types of imp-like 'darklings' that can attack foes, using 'dark tentacles' to impale foes or break down walls, using 'creeping dark' tendrils that sneak along floors, walls, and ceilings to take out foes from a distance, and creating a black hole that sucks anything nearby into it. However, as a result of Estacado turning 21 at the start of the game, the powers of The Darkness are available to the player, with some powers not being unlocked until later in the game.

The game includes a range of modern-day weapons that become available over the course of the game. The Darkness features an Italian-American hitman for the mafia named Jackie Estacado as the protagonist.

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