Shooting

To use your weapon’s Primary Fire function, tap the Ctrl key
or the left mouse button. For Secondary Fire, tap the Alt key
or right mouse button. For continuous fire, and other enhanced
firing functions, keep the fire key depressed. See Weapons for
detailed descriptions of each weapon’s Primary and Secondary
Fire functions.
Jumping
To jump, tap the Space bar. If you jump while running, you
will jump farther and in whatever direction you are moving.
Strafing
Learning how to strafe effectively to dodge the enemy is a vital
survival skill.
Swimming
When in deep water, use the movement keys to swim just as
you would to run. Look down and move forward to swim down,
and look up and move forward to swim toward the water’s surface.
Unless you are wearing Scuba Gear, you need to make sure
you come up for air from time to time or you will drown. Hold
down your jump key to tread water.