Galaxy at War, Mass Effect 3's multiplayer, is much more than horde mode. Galactic Readiness is key to your success in Mass Effect 3's single player. To increase your chances of kicking Reaper ass and taking Reaper names, gamers will participate in multiplayer's five theaters of war. When you choose a map, you're increasing the readiness for that map, or theater of war. Confused? Let the team at BioWare explain.