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Mass Effect 3 Guide

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This page contains a walkthrough for the main missions of Mass Effect 3. Major changes in the gameplay from Mass Effect are listed in the main Mass Effect 3 page, while the effects of importing a saved game from Mass Effect 2 are listed in the Save File Transfer page.


Main Plot Edit

The following missions represent plot progression. They have no time limit, but each mission must be completed before the next becomes available.

Prologue Edit

Act I Edit

Act II Edit

Act III Edit

Note: No side missions can be completed once you begin Act III, so finish up anything else you want to finish before heading to Cerberus Headquarters.

Side Missions Edit

These missions are issued or can be acquired as the game progresses. They are sorted according to the Priority mission after which they become available. The opportunity to complete certain side missions expires once specific main plot missions are completed. Others are marked as failed if not completed before a number of other missions are completed. These missions are noted below as "progress-sensitive missions" and "timed missions" respectively. Be aware that any side missions not completed before the main plot mission Priority: Cerberus Headquarters will no longer be accessible for the remainder of the game.

Note: Italicized mission names denote minor missions which can be completed merely through planet scanning, conversations, or finding an item during another mission.

Priority: The Citadel I Edit

Priority: Palaven Edit

Priority: Sur'Kesh Edit

Priority: Tuchanka Edit

Priority: The Citadel II Edit

Priority: Geth Dreadnought Edit

  • N7: Fuel Reactors
  • Rannoch: Admiral Koris
    • Main Plot Progression: Unlocks the main plot mission Priority: Rannoch.
    • Progress-Sensitive Mission: This mission expires if not completed before Priority: Rannoch.
  • Rannoch: Geth Fighter Squadrons
    • Main Plot Progression: Unlocks the main plot mission Priority: Rannoch.
    • Progress-Sensitive Mission: This mission expires if not completed before Priority: Rannoch.

Priority: Rannoch Edit

Priority: Thessia Edit

ME3 Icon Mass Effect 3 Guides ME3 Icon
Completion WalkthroughMoralitySearch and RescueEquipment and Items
Classes AdeptEngineerInfiltratorSentinelSoldierVanguard
Other Squad MembersPC TweaksInterruptsMerchantsThe One and Only
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