This year, Bungie is celebrating “Bungie Day” (7/7) with the release of new multiplayer map Cold Storage, as well as new gamer pics and a Bungie Day Xbox 360 dashboard theme, all for free on Xbox LIVE Marketplace. In addition, The “Halo 3” Legendary Map Pack will also drop in price to 600 Microsoft points in honor of the occasion.

The tradition of Bungie Day was born in part due to the significance the number 7 has played in all of Bungie’s games over the years, including the “Halo” series (7 Halo rings, Master Chief is Spartan 117, etc.), and each year the developer makes a point to use this date to treat fans to something special, usually new content, a free download or other surprise.

Fans will need to be sure they download these on 7/7, because they will be available for that day only.