Can’t get enough of Halo: Spartan Assault? Well, suit back up, Spartans, because the fight against the Covenant is far from over. 

Operation Hydra, a free game update with five new missions to battle through (check out the screenshots below for a taste), just started making the rounds. Don’t own Spartan Assault yet? All the more reason to buy the newly updated Windows Phone 8 game now. Version 1.1 includes the 25 original missions plus the five new ones. 

And there’s more good news: The update also adds support for phones with 512MB RAM, making the game available to even more Windows Phone models. 

Fans already know this top-down shooter is the first mobile Halo in the franchise’s 12-year history. Set in the years between Halo 3 and Halo 4, the game offers new insights into the first missions of the Spartan Ops program, the history of the Human-Covenant wars, and the rise of Commander Sarah Palmer. 

In the new five-mission Operation Hydra expansion update, you intercept a haunting alien signal after the destruction of planet Draetheus V. Following the signal to the core of the planet’s moon, you discover its terrifying source—and a surprising new mystery to unravel.