Cheat Mode
Start the game with one of the following command line parameters: For example, change your shortcut target to: "forces.exe" -allmissions

Result - Command line parameter

Mission select -allmissions
Enable in game cheats -cheatkeys
Unknown -notfullscreen
Unknown -demomode
Unknown -noembm
Unknown -nops
Unknown -safevs
Unknown -defaultmem
Unknown -nopuretnl
Unknown -nohwtnl
Unknown -noframescaleup
Unknown -noframewait
Unknown -do5p1
Unknown -nosplash
Unknown -skipintro
Unknown -screensize
Unknown -screenmode
Unknown -phase_text_used
Unknown -quickbreak
Unknown -debug
Unknown -extras
Unknown -cheatkeys
Unknown -antia
Unknown -multi2
Unknown -multi4
Unknown -edit
Unknown -particles
Unknown -noparticles
Unknown -limittexture
Unknown -localonly
Unknown -lodhud
Unknown -verbosehud
Unknown -nodamage
Unknown -singlestage
Unknown -nolensflare
Unknown -nosky
Unknown -framerate
Unknown -fileout
Unknown -keys
Unknown -mouse
Unknown -movie
Unknown -resetoptions
Unknown -no3dsound
Unknown -nosound
Unknown -alias
Unknown -latetextureload
Unknown -nodither
Unknown -nomipmap
Unknown -nobilinear
Unknown -notrilinear
Unknown -nofog
Unknown -nolighting
Unknown -lowdef
Unknown -noshadows
Unknown -nocd
Unknown -showloadingfilenames
Unknown -renewfile
Unknown -globalfile
Unknown -notauto
Unknown -no3dx
Unknown -nokni
Unknown -nowni
Unknown -notsc
Unknown -primary
Unknown -secondary
Unknown -compat
Unknown -storepad
Unknown -storeanims
Unknown -nolod
Unknown -autotgaconvert
Unknown -forcetgaload
Unknown -getfileinfo
Unknown -loadsfxeditcaps
Unknown -lowlod
Unknown -copylist
Unknown -filecopy
Unknown -fileextend
Unknown -view
Unknown -sensaura_demo
Unknown -sfxocclusion
Unknown -sfxcockpit
Unknown -sfxspecial
Unknown -sfxphantom
Unknown -sfxconic
Unknown -sfxnofrontend
Unknown -allmissions
Unknown -english
Unknown -french
Unknown -german
Unknown -spanish
Unknown -italian
Unknown -dutch
Unknown -swedish
Unknown -portuguese
Unknown -host
Unknown -join
Unknown -notimeout

In-game cheats
Enable the -cheatkeys code, then press one of the following keys during game play :

Key - Result

[F4] - Toggle one hit kills
[F3] - Toggle invincibility