Frontline is a first-person shooter where players take control of the protagonist player character in a first-person perspective where they fight through levels set during the Second World War against the Wehrmacht using historical weaponry of the era, performing a series of military operations. Briefings take place at the start of each mission, which advance the plot and introduce new characters. Each mission is structured through a number of linear levels, each with differing locations, levels of action and styles of gameplay. Initially the player character begins on the frontlines during D-Day backed up by other computer AI-controlled soldiers with an emphasis on fast action-orientated gun-based gameplay. As the story progress however, the player character is sent on a variety of other missions including a number of covert and undercover operations in locations such as military based, German-occupied towns and manors, submarines and countryside settings.