The map pack was produced by a collaborative effort between 343 Industries and Certain Affinity and features six remade multiplayer maps from Halo: Combat Evolved and Halo 2. The maps have been tweaked to match the Halo: Reach multiplayer by changing their layouts, weapon drops, and vehicles. In Forge, the original version is still available to be tweaked. The seventh map is Installation 04, the first Firefight map with active AI assistance.