Gain the upper hand over your Halo: Reach friends/foes by getting access to the upcoming Defiant map pack one day early. It's due out for normal folks on Tuesday, March 15 (for 800 Microsoft Points), but if you enter our contest below, you can be one of five lucky winners who gets a free download token on Monday.

Here's how to enter:

1.) Follow us on Twitter.

2.) Tweet this out to your followers:

Get the Halo: Reach Defiant map pack one day early, courtesy of @bitmob: http://bit.ly/i1QqtP

3.) Put your Twitter name and a link to your Tweet in the comments below as proof. (Find that link by clicking on the Tweet's date stamp.)

NOTE: When commenting, you must be registered on Bitmob with your real, full first and last name and a valid email address or else we won't count your entry. To register, click the link in the upper-right corner of the site.

On Monday, 3/14, when we get the prizes in hand, we will draw five winners at random and send them the codes via the emails they registered with on Bitmob (make sure @bitmob.com will get through your spam filters).

Good luck...and see below for descriptions of the three included maps, direct from Microsoft.

UPDATE:

Congrats to Dario Feddersen-Doyle, Hector Barrios, Ross Adams, Craig Andrews, and Fred Henkelmann!

We sent your codes via direct message on Twitter. Just realized it was easier that way since we had to check you were following us anyways (per the rules). ;)  Enjoy!

Please note that Matchmaking isn't live yet, but you can play those maps locally or with anyone you happen to know with an early code, too.

Condemned: Condemned takes place aboard Orbital Station Gamma, a massive space station high in orbit above the planet Reach. Prior to the Covenant’s overwhelming invasion, Orbital Station Gamma provided long-range communications for UNSC fleets and a vital lifeline between Reach and Earth. During the Battle of Reach, the station suffered terrible punishment at the hands of the Covenant, but a few fortified sections remain intact, fully pressurized, and ready for combat. Condemned supports 6-12 players in a variety of action-packed game types, including Team Slayer, Team Objective, and Free for All.

Highlands: Highlands takes place on the top-secret Military Wilderness Training Preserve on Reach. The Preserve is a large, wooded area where Spartan super-soldiers trained long before the war with the Covenant began. During the Battle of Reach, the Preserve was the site of key battles between the alien invaders and a group of Spartans who used their familiarity with these UNSC training grounds to significant tactical advantage…but not everyone who enters these woods makes it out alive. Highlands expands the fight with massive-scale engagements for 8-16 players in Big Team Battle, Team Slayer, and Team Objective.

Unearthed: Unearthed takes the battle for Reach to a large Titanium mine and refinery located in the Viery civilian sector of the planet. This particular mine was built to take advantage of the exposed titanium inside a massive meteor crater. The titanium produced here is used in much of the UNSC hardware, from the chassis of the Warthog to the meters-thick armor plating of capital ships like the UNSC Pillar of Autumn. While this facility was quickly abandoned when the Covenant arrived on Reach, it still has significant tactical (and economic) value, and it won’t be long before both humans and Covenant return to battle for control. Unearthed allows up to four players to launch a counterassault against the Covenant in Firefight and Firefight modes such as Generator Defense.