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There are numerous ways to increase readiness and depending on your import save status, single player decisions, multiplayer skill, and multiplayer time, the "most efficient" way to manipulate readiness doesn't really have a universal answer for players. Video consist of Destroy perfect ending where Shepard survive, Synthesis, Control and last but not least Refuse.
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Readiness Rating 2050 – Choose to become a Reaper and the Earth will be saved.
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Readiness Rating 1750 – Choose to Save the Reapers and the Earth will be saved.Readiness Rating
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