How many versions of One Night game available?

Context: The One Night Trilogy, comprising three games, One Night, One Night 2: The Beyond and One Night: Full Circle, is a series of 2D tile-based overhead psychological horror games. The three games tell the story of an attempt to invade Earth by a race of supernatural shadow people and a collection of protagonists who must survive the attacks and fight against them. The origins of the creatures and their motives are detailed in the prequel, One Night 2: The Beyond, while the first and third games deal with subsequent invasion attempts and the conclusion to the conflict.

Answer: The One Night Trilogy, comprising three games, One Night, One Night 2: The Beyond and One Night