The demo includes a modified version of the first level of the full game.
To add the optional introductory and end-level cutscenes, unpack the contents of dforces2.zip and dforces3.zip into the same directory where the demo is installed.
NOTE: This game can be played directly in Windows using a third-party engine recreation (see the links section below).
Enter one of the following codes during the game to cheat:
laimlame - Invincibility
laterminate - Invincibility and infinite ammo
lapostal - Weapons, shield, and health
lamaxout - Full items, weapons, and ammo
labrady - Full ammo
launlock - Full inventory
lacds - Full map
laskip - Level skip
larandy - Supercharge weapons
ladata - Display coordinates
lantfh - Teleport to current map position
laredlite - Enemies freeze when killed
lapogo - Disable height checking
labug - Enable 'insect mode'
Description by VGTips