Microsoft describes Standoff (pictured here) as "ideal for mid-sized objective and Slayer game types" due to its symmetrical layout and boulder-filled battlefield. Rat's Nest (pictured here) is said to be "an indoor vehicle paradise" best suited for big team battles, whereas Foundry (pictured here) is "the ultimate Forge map" as players can manipulate and replace every object object within it to create their own custom arena.

The maps will eventually be provided free of charge, similar to Microsoft's efforts with Halo 2's downloadable content as well as that of Epic Games' Gears of War. According to the publisher, players can expect the Heroic Map Pack to be free in spring 2008, "just prior to the next wave of all new 'Halo 3' multiplayer maps."