Microsoft has released Halo: Spartan Assault worldwide.
Developed by 343 Industries in conjunction with Vanguard Games, the top-down shooter is available for £4.99 / $6.99 on Windows 8 and Windows Phone 8 (see device compatibility notes below).
Set within a narrative that bridges the gap between Halo 3 and Halo 4, Spartan Assault explores the origins of the Spartan Ops program through the eyes of either Commander Sarah Palmer or Spartan Davis, while providing a deeper look at the back story of the Human-Covenant War.
The game's 25 levels will take about several hours to get though and certain milestones will unlock Achievements on Halo 4. Post-release content is planned, with weekly challenges in place and content add-ons pencilled in.
"We wanted to do something really different since we were working on mobile platforms," said Dan Ayoub, executive producer on Halo: Spartan Assault. "However, we needed to make sure it still retained that classic 'Halo' feel, so it became our goal to create the right experience for the right screen."
"For both the right and wrong reasons, Spartan Assault is one of the most interesting additions to the Halo series in years," CVG wrote in this recent Halo goes mobile feature.
Device compatibility notes:
On Windows Phone 8, 1GB RAM currently required. Version supporting 512MB RAM Windows Phone 8 coming August 2013. Performance on 512MB phones may vary.
In the US, Halo: Spartan Assault for Windows Phone 8 is available first for Verizon Wireless customers from July 18 through Aug. 16