Dealspwn.com presents ten essential tips and strategies to survive in the cut-throat battles of XCOM: Enemy Unknown.
"Nothing gives you battlefield domination like a well-placed sniper, but since they can't move and fire in the same turn without equipping a restrictive perk, they can be hard to use effectively. However, by equipping the Squadsight perk, they can fire on any enemy unit that their squadmates can see, allowing you to use your frontline troops as spotters while keeping your sharp shooter stationary.
You'll want to get your sniper to central high ground as quickly as possible, preferably using grappling hook-equipped Skeleton armour to secure lofty rooftop perches. A S.C.O.P.E. gadget (more on that later) will increase his/her accuracy to insane levels, while the Gunslinger ability will give their pistol sidearm some much-needed clout if Floaters manage to compromise their position."