Night Trap is an interactive movie video game that uses full motion video (FMV) to present the story and gameplay. The player is instructed by the in-game police squad to watch live surveillance footage of the Martin household and trigger traps to capture anyone that is seen endangering the house guests. Cameras are situated in eight locations in and around the house: the entryway, living room, kitchen, bedroom, bathroom, driveway, and two hallways. A map is available as well so the player can see how the rooms are connected. The player can freely switch between viewing the different cameras to keep up with house activities and pick up clues from conversations. Kelli, an undercover agent, will also provide clues to the player. The player must avoid trapping her, any other agent, or the house guests.
When someone is within range of a trap, a sensor bar will move into a red zone. Activating the trap at this moment will capture them. If the trap is activated when the bar is not in the red zone, the trap will not work and will become disabled for a short period of time. The traps will also only work if the access code is correct. There are six possible access codes, and the player can eavesdrop on conversations to find out when the Martins change the code. When a new code is learned, the player must wait until the speaker leaves the room before changing the access code to the correct color to maintain control of the traps. Counters on the screen indicate how many perpetrators have entered the house and how many have been captured.