X-COM - First Alien Invasion

Hint 1:
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Be wary of the power-up question marks. Yes, they can be neat, but they 
often hide a land mine that can take out a trooper or an alien in one burst.


Hint 2:
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Rockets and blaster bolts affect not only what they hit, but also everything in
adjacent squares. So although a rocket launcher's range is six tiles, it can 
damage seven tiles (six tiles plus a one-tile fragmentation range). 


Hint 3:
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Use the Move and Fire order to duck out of a door, snap off a shot, and then 
duck back inside. This hides your soldier from return fire during your opponent's
turn. 


Hint 4:
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Use the Etherals' psionic power on the most powerful enemy target visible. 
Although the attack does little damage, the psionically controlled target may 
fire at its fellow troopers (or at itself for that matter). You want that 
friendly fire to hurt.


Extra damage
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Missiles and blasters can damage objects in squares that are directly next to 
the target due to fragmentation damage. This effectively extends their range 
by one square.