Dark Fall II: Lights Out is a 2004 first-person psychological horror/adventure game developed by British studio XXv Productions and published by The Adventure Company for Microsoft Windows. In 2009, Darkling Room released a director's cut of the game in a limited "Pins & Needles" edition. Later that same year, Iceberg Interactive released the Director's Cut in both a stand-alone edition and as part of Adventures in Terror: British Horror Collection. The original version of the game was made available on Steam in December 2013. Lights Out is an indirect sequel to the 2002 game Dark Fall, telling an unrelated story, although it does feature a recurring minor character. A third Dark Fall game, Dark Fall: Lost Souls, was released in 2009. A fourth title ‘’Dark Fall: Ghost Vigil’’ was released in 2020.

The game tells the story of Benjamin Parker, a cartographer sent to Trewarthan, Cornwall in 1912 to map the coastline. Whilst there, he becomes embroiled in the disappearance of three lighthouse keepers from the offshore Fetch Rock Lighthouse. Accused of murdering the three men, Parker must jump back and forth through time, facing a powerful entity known as Malaki, whose involvement with the disappearances Parker must attempt to unravel.

Lights Out received mixed reviews, with critics praising Jonathan Boakes' individual work on the game and his obvious passion for the adventure genre. Some also praised the atmosphere and storyline. Common criticisms focused on the game's technical limitations, specifically its graphical presentation, and predictable gameplay. Most critics also felt the game failed to improve on the original Dark Fall.