About
On Steam, 76% of 2,154 player reviews are positive (Mostly Positive). 33 people are playing it on Steam right now, with a peak of 75 in the last 30 days. Valve rates it Unsupported on Steam Deck. The main story takes about 18 hours, doing everything about 56 hours. It was nominated for 1 award.
Mass Effect 3 is an action role-playing game in which Commander Shepard leads a final campaign against the Reapers, a machine race that has invaded Earth and is conquering civilizations across the galaxy. Players recruit squad members from various species and classes, forge alliances, and make choices that determine which characters survive. Combat features squad-based tactics with combinable biotic and tech powers, blind fire, and enhanced melee attacks. The game includes a cooperative multiplayer mode where up to four players fight waves of enemies to liberate conflict zones. Progress in multiplayer contributes to war preparedness in the single-player campaign. New and returning squad members join Shepard's team, including soldier James Vega and EDI, an AI in a physical body.
Story
The Reapers invade Earth and quickly overwhelm its defenses. Commander Shepard escapes and is tasked with rallying the galaxy's civilizations to build a united military force and complete the Crucible, a Prothean superweapon that may be capable of stopping the Reapers. Old conflicts between species must be resolved before any alliance can hold. From curing the Krogan genophage to settling the Quarian-Geth war, Shepard must broker impossible alliances while Cerberus, a human supremacist organization, works to undermine the effort at every turn. The fate of the galaxy depends on the strength of the force Shepard can assemble and the choices made along the way.
What is happening now
Mass Effect 3 is BioWare's action RPG conclusion to the original trilogy, blending shooter combat with dialogue-driven storytelling and strategic squad-based encounters. Released in 2012, it sent Commander Shepard on a final mission to determine the galaxy's fate through a series of pivotal choices. The game remains a point of discussion years later, particularly around its ending sequence and the multiple paths players could take to resolve the conflict. Coverage continues to highlight standout character moments, including notable relationship developments among the Normandy's crew and what many consider memorable dialogue from the campaign's climax. The trilogy's branching narrative choices and their consequences continue to resonate with players revisiting the experience.
How long to beat Mass Effect 3
from 6 playersMore in the Mass Effect series
All 6 games in orderFrom the people behind Mass Effect 3
shared cast and crewGames like Mass Effect 3
same kind of game, other seriesCast and crew
5 creditsCrew
Awards
0 won, 1 more nominationMedia
Releases
Earliest full release on each platform; regional dates can differ.
PC and Steam Deck
Steam store pageSteam Deck: Unsupported Valve reports it does not run
Requirements and Deck status as listed on Steam, checked Oct 28, 2026.
Mass Effect 3 player count
concurrent players on SteamPlayers counted on Steam every one to six hours; the daily peak is the highest count of the day.
Mass Effect 3 achievements
68 achievements on SteamRarest
All 68 achievements by how many players unlocked them
Share of Steam players who unlocked each achievement.