Halo: Spartan Assault can now be purchased from the Xbox Live Marketplace for $14.99. Featuring 30 action packed missions, with an optional, 5 mission, online co-op mode to boot, this game should keep fans of the Halo franchise occupied for quite a while. Additionally, the "Operation Hydra" expansion pack will be included in this version, though only for the single-player campaign.

Spartan Assault features a new type of enemy known as the Flood. Battling the Flood is different from the more traditional Covenant enemies, in that the Flood acts as just that – a flood of enemies. The goal is to not get overwhelmed. Mike Ellis, Design Director at 343 Industries talked about how the game was designed with supplemental teamwork in mind. “If one person is using a short-range weapon against the Flood, I would use the long-range weapon to take care of the big guys. We can stand on the turrets together in order to maximize our fire power.”

What's interesting is the fact that Spartan Assault actually has different achievement point values on both platforms and Xbox One exclusive achievements as well. Here's the list of the co-op specific achievements for the game and their values on each platform.

This isn't going to be a straight port of the original game, instead we'll be getting new missions and an online co-op mode for two players. The new missions will reintroduce the Flood as an enemy as well as add new weapons, armor abilities, and other power-ups.