Call of Duty: Black Ops III

Call of Duty: Black Ops III is a first-person shooter from Treyarch. Its campaign is set in a future where soldiers use cybernetic enhancements and carry out missions as part of a special unit. The Steam edition also includes Zombies Chronicles, which brings eight remastered zombie maps from earlier games in the series.

The game has three modes: a story campaign, multiplayer and Zombies. The campaign is a run of dynamic missions with large firefights and a set of abilities; in Zombies you fend off waves of the undead on separate maps, and you can play it solo.

According to HowLongToBeat, the campaign takes about 9 hours and a 100% run about 86 hours. A month at two hours a day is more than enough for the campaign and a good part of Zombies. The game is mostly known for multiplayer, but on rental you get the single-player part; online multiplayer is not included.