Secret Service, a first-person shooter, begins on Inauguration Day as President-elect Pierce is shot and attacked. The player takes on the role of agent Pierce as insurgents attempt to take over Washington D.C. With small puzzle elements that involve unlocking doors and defusing bombs, gameplay alternates between action and challenge.
Gameplay involves shooting and completing objectives in a variety of settings, from office buildings to public spaces. The player must also solve puzzles to progress through the game, such as connecting wires to chips to unlock new paths. As the game progresses, these puzzles become increasingly difficult, requiring the player to think critically and strategically.