In Doom 3, the BFG 9000 is a charged weapon: holding down the trigger causes the weapon to accumulate energy before release, resulting in a more powerful shot. One peculiar quirk about the internal workings of the game code is that it remembers the direction in which the player fired the shot, but not the position, meaning that the player is allowed to move far away, even into an entirely different room, and still deal damage to whoever is in that room, depending on the timing of the projectile's impact. This tracer effect is why it is optimal to stand close to the target in order for them to soak up as many tracers as possible. The BFG's internal game mechanics are two-fold: the actual projectile deals a significant amount of damage (100-800), but the majority of the damage is dealt in a 45 degree cone facing away from the player who fired the shot via 40 'tracers', each dealing between 49 and 87 damage. The BFG 9000 also appears virtually unchanged in Doom II: Hell on Earth, Final Doom, Doom 64, and Doom RPG.

In the first Doom, the weapon can only be picked up in the third and fourth episodes. The most powerful weapon in the game, it causes major damage to most types of enemies and can clear an entire room of foes in one shot, or deal huge damage to singular enemies. It is a large energy weapon that fires giant balls of green plasma. In that version, the BFG 9000 released a cloud of 80 small plasma balls (randomly green or red) that could bounce off floors and ceilings per shot, however this version of the BFG was scrapped for the below version, as John Romero, a developer for Doom, stated that 'It looked like Christmas', and it severely slowed down the game due to the large number of projectiles.Ĭomputer Gaming World described the BFG 9000 in the first commercial Doom game as 'the Ultimate Weapon'. The first appearance of the weapon is the press beta release of Doom.

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