The Heroic Map Pack is the first map pack released for Halo 3.
Summary
It includes three maps: Standoff, Rat's Nest, and Foundry. It was released at 2:03 AM on December 11, 2007, originally available for 800 Microsoft Points exclusively on Xbox LIVE Marketplace. Each map presents a totally different play style. There are a handful of new Forge items usable on these maps that were just static parts of the environment on previous maps. These items range from shield walls to man-cannons, to other novelty objects, such as large soccer balls.
Due to its unpopularity the Heroic Map Pack became free to download March 25, 2008.