The BFG 's projectile consists of a computer chip contained within a massive ball of relatively slow-moving green plasma, the strength of which is determined via a charge-based system: holding down the trigger causes the weapon to charge through four different power levels for a more powerful shot, the status of the charge being displayed on the weapon's integrated monitor which also displays the ammo count, dispensing with a game HUD, just like plasma gunchaingunand machine gun.Д¬aution must be utilized, as if the weapon is charged beyond the fourth level, the weapon will explode and will instantly kill the player wielding it. Comparing the weapons visually, the Doom 3 version is more compact, lacking a harness, has a shiny smooth metallic framework versus the original's rough design studded with various technological implements, and totally lacks the corrugated aperture that was shared with classic Doom's plasma gun. It is lost during the transits to and from Hell where it is available as a pick-upbut the player manages to retrieve it again in the CPU Complex by taking it from the corpse of Sabaothwho had stolen it from Campbell after leaving him fatally wounded.

It is first introduced in UAC Administrationwhen Campbell opens his suitcase to an unknown green glow green being associated with the colour of the BFG projectile. The BFG initials for ' B ig F ucking G un' of Doom 3 is one of the weapons created by the Union Aerospace Corporation under its weapon research programme, and is considered the most powerful weapon of the game.

Doom 3 bfg gun