Halo: Spartan Assault launches in North America today

343 Industries and Vanguard Games' Halo spin-off title, Halo: Spartan Assault, will be available for download from July 18 for Windows 8-operated PCs, tablets, and Windows Phone 8 devices, according to Microsoft. The game costs $6.99.

The mobile version will only be available on Verizon Wireless until August 16. The game requires 1GB RAM on Windows Phone 8 devices; the version made for 512MB RAM Windows Phone 8 devices will be out later this August. There is currently no word on the game's release date in other regions.

The twin-stick-controlled top-down shooter takes place between the events of Halo 3 and Halo 4. The game contains 25 missions, integration with Halo 4 that includes additional experience points and unlockable Spartan emblems, and in-app purchases. Check out GameSpot's latest coverage for more information.