MOUSE VERSION
Arrow keys or WASD: move.
Aim using mouse.
Left mouse button: shoot with primary weapon.
Spacebar: shoot with secondary weapon.
1 ... 6 keys or rolling mouse wheel: select primary weapon.
7 ... 0 keys: select secondary weapon.
ESC: show help.

KEYBOARD VERSION
Arrow keys: move.
A key: shoot with primary weapon.
S key: shoot with secondary weapon.
Spacebar: strafe.
1 ... 6 keys or rolling mouse wheel: select primary weapon.
7 ... 0 keys: select secondary weapon.
ESC: show help.