Microsoft has finally released Halo: Spartan Strike for Windows Phone and Windows 8.1, several months after it announced a delay in the game's release from December 2014 to "early 2015".

The sci-fi top-down shooter is a sequel to the 2013 game Halo: Spartan Assault. Both games were developed by Vanguard Games in coordination with the Halo series's main team at 343 Industries. The game is priced at $5.99 for both versions and is a universal app, which means if you buy the Windows Phone version you get the game for Windows 8.1 for free and vice-versa.

Here's a quick description of the game:

"Halo: Spartan Strike tells a compelling new story in the Halo universe set during the events of Halo 2 on New Mombasa in 2552. As a Spartan supersoldier in a classified ONI simulation, delve into 30 challenging missions while leading UNSC troops through cities and jungles with an all new arsenal of weapons, abilities and vehicles."

"No matter where you are, Halo: Spartan Strike provides fans a piece of the Halo universe with improved touch controls and updated graphics for an enhanced pick-up-and-play experience."

"In addition to the campaign, players on Windows 8 devices can compare performance against friends in weekly challenges and attempt to take the top spot on the leaderboard. Earn Achievements that unlock an exclusive emblem, nameplate and avatar in Halo: The Master Chief Collection on Xbox One."

The good news for Windows Phone owners is that it is compatible with 512MB devices and is "buy once, get everywhere (phone, PC)". The bad news? No free trial. Also note, for the phone the game is a massive 864 MB to download!

Download Halo: Spartan Strike from the Windows Store - $5.99, no trial

Download Halo: Spartan Strike from the Windows Phone Store - $5.99, no trial

512MB RAM devices supported

QR: Halo Spartan Strike