Dark Sector is an action game where you play as Hayden Tenno, a black-ops agent sent into Lasria to destroy a virus that turns people into mutants and eliminate its creator, Mezner. The mission takes a turn when Hayden is infected with the virus himself, giving him new powers like invisibility, shields, and a special knife-like weapon called the glaive.
As you explore the game world, you can also use regular firearms like shotguns or pistols, which can be taken from enemies or bought from the Black Market. You can even modify these weapons to suit your playstyle.
The multiplayer mode is divided into two modes: Infection, where one player takes on the role of a fully mutated Hayden and the others hunt them down as ordinary soldiers, and Epidemic, where two teams, each with their own Hayden, try to kill the other's mutant.