Dying Light

Dying Light is an open-world zombie survival game from Techland, the creators of Dead Island and Call of Juarez. It is set in a city devastated by a mysterious viral epidemic. Agent Kyle Crane arrives with a secret mission and has to make a hard choice: stay loyal to his superiors or save the survivors.

The game is played in first person. Parkour lets you scale buildings and reach remote areas, and combat mixes melee weapons, the environment and various abilities. You scavenge for supplies, craft weapons, take on missions and explore the streets. The key feature is the day and night cycle: by day the city is relatively bearable, but once darkness falls the streets become far more dangerous.

According to HowLongToBeat, the story takes about 19 hours and a full run about 65. In a month at roughly 60 hours you can finish the story and most side content with room to spare, but a 100% run may run slightly short. You can play alone, and the game also offers online co-op and PvP modes, so both a single-player campaign and online play are there.