Looks like the XO version of Spartan Assault is 60% off if you have it on WP8/Windows 8
http://news.xbox.com/2013/12/games-spartan-assault-qa
http://news.xbox.com/2013/12/games-spartan-assault-qa
a new and improved “Halo: Spartan Assault” comes to Xbox One via a digital download priced at $14.99. Not only will the game look gorgeous on the Xbox One thanks to its native 1080p resolution and smooth 60 fps frame rate, it will also feature a brand-new cooperative mode, new weapons, and the inclusion of the “Operation Hydra” add-on.
Best of all, fans that have purchased “Halo: Spartan Assault” for Windows 8 devices 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. And don’t worry, Xbox 360 owners: “Halo: Spartan Assault” will be available on your console in January 2014 and will offer the same affordable pricing ($14.99) and upgrade discount ($4.99) as the Xbox One version.
We’re really excited about the Xbox One version of "Spartan Assault," as this came to be due to strong demand from the fan base. The Xbox One version will feature all of the modes and content from the original mobile version (optimized for your console), including the "Operation Hydra" add-on. In addition, we are introducing a new co-op mode that will allow players to play together in some pretty frantic gameplay versus an old enemy.
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