Once Upon a Crime in the West is a first-person mystery game set after a bloodbath in an isolated inn on the twelfth day of Christmas. As one of the inn's inhabitants, the player re-experiences various events on the eleven preceding days in an attempt to piece together who killed who on the twelfth. On each day, a new person visited the inn, subsequently laying the grounds for more and more interactions between the ever-increasing cast, which also provides the player with clues and other foreshadowed elements.
