Metro: Last Light trailer details factions, mutant tactics

If you are buried in a subway system after a nuclear holocaust, it's good to have a plan. A new trailer for Metro: Last Light offers the second in a series of survival guides for getting out of the Moscow subway alive.

The video goes into detail about the various human groups inhabiting the subterranean system, as well as tactics for getting you past enemies and conserving ammo. And beware of the big bad mutants, as there is no reasoning with them.

The game will be out on May 14 for PC, Xbox 360, and PlayStation 3.

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