Dying Light is an open-world first person survival horror video game developed by Polish video game developer Techland and published by Warner Bros. Interactive Entertainment. It was released in January 2015 for Microsoft Windows, Linux, PlayStation 4, and Xbox One. The game revolves around an undercover agent sent to infiltrate a quarantine zone in a city named Harran. It features a zombie-infested, open-world city with a dynamic day and night cycle where gameplay is focused on weapons based combat and parkour free running. At release, Dying Light received mostly positive reviews from critics, with praise mainly directed at the combat, graphics, co-operative multiplayer, navigation and the day-night cycle, while receiving criticism regarding the game's story, difficulty and technical issues. The game was the best-selling title for the month of January 2015 and broke the record of the first month sales for a new survival horror intellectual property.