Stealth video games are video games with a focus on completing the game (or a significant section of it) without being discovered by the game's antagonists. This is a diverse genre, with elements being present in several game series.
The core idea behind stealth games is to complete objectives while avoiding detection by enemies as much as possible, if not altogether. As such, mechanics are closely tied to the environment and the enemies' sensory capacities. This may include light and darkness, objects from which to hide from enemies, or hidden tunnels.