Dark Sector is an action game where you play as Hayden Tenno, a black-ops agent sent to Lasria to destroy a virus that turns people into mutants and eliminate its creator, Mezner. The goal is to find and stop Mezner, but things don't go as planned.
When you find Mezner, you're infected with the virus, which changes your life forever. Your right arm mutates, giving you new abilities like invisibility, shields, and a special glaive that can be used in both close combat and at a distance.
As you navigate through the game, you'll also use regular firearms like shotguns or pistols, which you can collect from enemies or buy from the Black Market. These guns can also be modified to suit your playstyle.
The multiplayer mode offers two different options: Infection, where one player takes on the role of a fully mutated Hayden and the others have to hunt them down as ordinary soldiers; Epidemic, where two teams of Haydens try to take each other out.