Set between the events of “Halo 3” and “Halo 4,” “Halo: Spartan Assault” explores the first missions of the Spartan Ops program and dives deeper into the backstory of Human-Covenant wars. Play through the eyes of either Commander Sarah Palmer or Spartan Davis stationed aboard the UNSC Infinity as they fight in never-before-seen battles against Covenant forces.

With over 30 stimulating missions featuring unrivaled action and intensity, the single-player experience allows you to compete against friends in Leaderboards or hone your skills with Weekly Challenges. Replay the missions to collect more than 40 in-game Achievements and Medals.

For fans who already have a prospering Spartan career aboard the UNSC Infinity, “Halo: Spartan Assault” lets you earn experience points (XP), all-new Achievements, and emblems for your “Halo 4” Spartan, with additional integration features available after launch.

Top features in “Halo: Spartan Assault” for Xbox One include the following:

• Immersive storyline. An original story set between the events of “Halo 3” and “Halo 4,” experience war with the Covenant, the first missions of the Spartan Ops program and the rise of Commander Sarah Palmer
• Online cooperative multiplayer. Play longer than ever with an online cooperative multiplayer mode that brings you five all-new missions, all played from a top-down camera view
• New enemies. Wage war against a persistent and overwhelming enemy – encounter the Flood for the first time in “Halo: Spartan Assault”
• Graphical Fidelity. ”Halo: Spartan Assault” for Xbox One will run natively at 1080p and 60 frames per second.
• New weapons and achievements. Go in strong with an expanded arsenal that brings you more weapons, armor abilities, and more upgrades, while earning new Achievements for Xbox One
• Original “Halo” gameplay. An action-packed, stimulating single-player campaign spanning 30 missions in battles throughout the Halo Universe (including five “Operation Hydra” missions)
• Nonstop competitive fun. Compete against friends in Leaderboards or hone your skills while collecting more than 40 in-game Achievements and Medals

Halo: Spartan Assaul” will be available for $14.99 via digital download. Fans that have purchased “Halo: Spartan Assault” for Windows 8 or Windows Phone 8 to date or purchase prior to December 15, 2013, will be eligible to purchase the Xbox One version of the game at the discounted price of $4.99. Halo: Spartan Assault for Xbox 360 will be available in January 2014.