Aside from cooperative multiplayer, additional interfaces on iOS and Facebook were planned, each with their own 'hooks'.

There are multiple ways to interact with Galaxy at War that will affect the Galactic Readiness rating. If Galactic Readiness is at 50%, the lowest level it can fall to, then the player's EMS will be reduced by 50% as well. If Galactic Readiness is at 100%, then the player's EMS will be 100% of all available War Assets.

The total number of War Assets obtained by the player represents potential Military Strength. War Assets and Galactic Readiness combine to determine the player's overall Effective Military Strength (EMS) rating. Players can acquire different War Assets while playing Mass Effect 3 or Galaxy at War interfaces. They include armies, fleets, and vital supplies that can improve the chances of Allied forces against the Reapers. War Assets are the resources of the galactic war effort. Galactic Readiness can be increased by utilizing Galaxy at War interfaces, listed below. The higher the Galactic Readiness level is, the more prepared Shepard's forces will be for the final confrontation against the Reapers. Galactic Readiness measures Commander Shepard's influence and ability to utilize the galaxy's resources. Galactic Readiness and War Assets Main article: War Assets Using Galaxy at War is optional and the same outcomes can be achieved by playing only the single-player. The goal of Galaxy at War is to prepare the galaxy for a counterattack to defeat the Reapers the level of preparation will determine the outcome of that battle. A color-coded map displays the player's progress in the conflict. Mass Effect 3: Galaxy at War provides a strategic outline of the state of the galaxy in the midst of the war against the Reapers.

How to play galaxy at war mod