Alien Swarm

Alien Swarm cheat codes: 
Press [~] during game play to display the console window,
then type sv_cheats 1 to enable cheat mode. Then, enter one
of the following codes at the console window.
asw_god 1                  - God mode
asw_gimme_ammo             - Full ammo and all weapons
asw_gimme_health           - Full health
asw_auto_reload 0          - Disable auto-reload
asw_horde_override 1       - Enable The Director
exec 360_controller_pc.cfg - 360 controller support
firstperson                - First person view
asw_tilegen                - Level tile-based generator
openserverbrowser          - Server browser

Note: Cheat codes cannot be enabled during in offline practice.