Halo: Spartan Assault is now available on Xbox One, just in time for the holidays. The top-down shooter is $14.99 and out one day earlier than it was expected to launch on the next-gen platform. The game is still coming to Xbox 360 in January after it already arrived on Windows 8 and Windows Phone 8 devices in July.

Developed by 343 Industries and Vanguard Games, Halo: Spartan Assault is set between the events of Halo 3 and those of Halo 4. In it, players take control of either Commander Sarah Palmer or Spartan Davis, completing more than 30 missions against Covenant forces. The game includes online cooperative multiplayer as well, though it will not be cross-compatible between Microsoft's two home consoles.

[Thanks, Chum!]

This article was originally published on Joystiq.