The Hidden: Source is a multiplayer first-person shooter with a unique twist. In this game, one player takes on the role of "The Hidden," a nearly invisible, agile character with enhanced abilities, while the rest of the players form a team of heavily armed soldiers known as the I.R.I.S. task force. The Hidden must use stealth, speed, and cunning to eliminate the soldiers, while the soldiers rely on teamwork and strategy to track and kill The Hidden. The game's tension lies in the stark contrast between the hunted and the hunters, with a focus on suspense and ambush tactics.