Direct copy and paste from Waypoint below:

Fans that have purchased Halo: Spartan Assault for Windows 8 or Windows Phone 8 prior to Dec. 15, 2013 are eligible to purchase the Xbox 360 version of the game at the discounted price of $4.99**. In order to take advantage of this special offer, DO NOT purchase the regular version INSTEAD follow the instructions below:

If you’ve bought Halo: Spartan Assault on Windows 8 or Windows Phone 8 prior to Dec. 15, 2013, you can redeem the game from the same account you purchased the Windows 8 or Windows Phone 8 version at the discounted offer (USD $4.99) through the Xbox 360 Dash on either the Home channel, the Games channel, or the Arcade channel.

Note: If you try to purchase the discounted Xbox 360 version on Xbox.com or if you navigate directly to the Halo: Spartan Assault Game Details Page, you’ll see the full price, not the discount. We are experiencing a delay in delivering the upgrade promotion to those who are eligible outside the US. We encourage you to check back here for details on how to redeem once the discount is available through the Trial, on Feb. 25.

Here’s more detailed instructions on how to get your discount:

Home channel:
Available on this channel from Jan. 31st – Feb. 2nd in US

1. Turn on your Xbox 360 console and log in to the profile with which you bought Halo: Spartan Assault on Windows 8 or Windows Phone 8.
2. Once you’re signed in to your profile, you will be automatically taken to the “Home” channel on the 360 Dash.
3. To verify you’re on the Home channel, look above the tiles to see the list of available channels. “Home” should be highlighted. If you’re not on the “Home” channel, press LB or RB until you’re there.
4. Look for a tile with the Halo: Spartan Assault key art on it.
5. Click on that, and you will be taken to the purchase page for the game at the discounted price, and purchase as usual!

Games Channel:
Available on this channel from Feb. 3rd – Feb. 14th in US

If you do qualify for the offer and don’t see the it on the Home page, don’t panic! Go check the “Games” channel to see if the Halo: Spartan Assault slot is there. Here’s how:

1. Turn on your Xbox 360 console and log in to the profile with which you bought Halo: Spartan Assault on Windows 8 or Windows Phone 8.
2. Press LB or RB to navigate channels until “Games” is highlighted.
3. Look for a tile on the Games channel that has the Halo: Spartan Assault key art.
4. Click on this tile, and you will be taken to the purchase page for the game at the discounted price, and purchase as usual!

Games Arcade Channel:
Available on this channel from Jan. 31st – Feb. 28th

1. Turn on your Xbox 360 console and log in to the profile with which you bought Halo: Spartan Assault on Windows 8 or Windows Phone 8.
2. Press LB or RB to navigate channels until “Games” is highlighted.
3. Click on the “Browse Games” tile, located on the left edge of the channel.
4. Press LB or RB until you are on the “Arcade” channel.
5. You should see a tile with Spartan Assault key art on it.
6. Click on this tile, and you will be taken to the purchase page for the game at the discounted price, and purchase as usual!

For more information about Halo: Spartan Assault, visit the official Halo: Spartan Assault page.

**Discount offer requires original purchase of “Halo: Spartan Assault” for Windows 8 PCs and tablets, or Windows Phone 8 and login using a valid Xbox profile. Matching Xbox profile required for discount when purchasing “Halo: Spartan Assault” on Xbox One and Xbox 360.  

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Okay folks, I expect some of you who got it for Win8 to get it for the 360! I need people to game with me in this. Well, not that I NEED, rather I want people to game with me in this. I know it’s easy enough to play solo. I just have more fun when gaming with others.

-Sal