5.2.9 Listen to the sounds in alien movement phase
The sounds in alien movement phase can reveal important clues to
alien locations. Normal door clicking means the aliens are near
a regular building (farm house, etc.) Hydraulic door sounds
means the automatic doors were used. Two sounds close together
means someone just went in and immediately came back out (or vice
versa). COROLLARY : the length of the alien movement phase is
also proportional to the number of aliens left on the map.
(Remember that stunned aliens or civilians can wake up!)

5.3 Weapon Tactics
Different weapons should be used differently and in different
circumstances. Here are some suggestions on how to best employ
the different weapons.

5.3.1 Pistols and Rifles
Use them only when you have to, sniper style. Dump them for
lasers as fast as possible. They use clips and doesn't do much
damage. They may be enough to use against Sectoids, who has
little armor, but not against tougher enemies.

5.3.2 Heavy Cannon
More accurate than the auto-cannon and slightly more damage, but
a lot less effective with only six shots and no auto-fire mode.
I'd rather use the auto-cannon.

5.3.3 Auto-Cannon
Probably the most effective weapon in the early game, with auto
mode, three types of ammo, and 14 shot magazine. Still, 14 shots
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