MindJack is a third-person shooter incorporating a cover system. The player character can carry two weapons and grenades. The player can mind hack civilians and weakened enemies, controlling them as the player character while the main character is controlled by artificial intelligence. Weakened enemies can also be turned to the player's side, becoming allies. Online players can "hack" into a person's single-player campaign and take control of the AI enemies while Player 1 plays the game's story campaign. The online players may help the solo player by attacking other enemies or they can attack Player 1 themselves.