BFG (weapon)

The first appearance of the weapon is the press beta release of Doom. 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.

Computer Gaming World described the BFG 9000 in the first commercial Doom game as "the Ultimate Weapon".[3] It is a large energy weapon that fires giant balls of green plasma. 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. In the first Doom, the weapon can only be picked up in the third and fourth episodes. The BFG 9000 also appears virtually unchanged in Doom II: Hell on Earth, Final Doom, Doom 64, and Doom RPG.

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. 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. One peculiar quirk about the internal workings of the game code is that it remembers the direction the player fired the shot in, 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.[4]

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. Overcharging the BFG too much will cause it to overheat and explode, killing the player instantly.

Quake II and Quake III Arena pay homage to the BFG 9000 with a pair of weapons both called the BFG10K. The Quake II version fires a slow plasma glob that fires rays at any enemies in range and line-of-sight. The Quake III Arena version of the BFG fire a series of fast plasma orbs, and acts quite like the Rocket Launcher (rocket jumping can also be done with the BFG10K). BFG10K from Quake III also appears in OpenArena (different look, but same behavior) and Quake Live (with slightly modified characteristics). Rage also pays homage to the BFG 9000 with a weapon known as the "Authority Pulse Cannon", which fires "BFG Rounds".

In the Doom movie, the "bio force gun" fires a bright blue projectile which appears to burst on impact and spray a caustic substance over its target and the surrounding area.

The BFG makes a return in the 2016 reboot, but unlike in its first two appearances, it follows the mechanics of its Quake II rendition, firing a projectile that shoots beams at enemies. The game itself doesn't resolve the acronym "BFG" either in-game or in its codex entries, although one challenge in the game's final campaign level involving the BFG is called "Big [REDACTED] Gun" as a nod to the original vulgar name.[5] In that game's pinball adaptation, it is called the "Big Fancy Gun", and is the most powerful weapon that the Doom Slayer can obtain;[6] collecting it will grant the player an extra ball. It also makes a return in 2020's Doom Eternal, where it's functionally identical to the 2016 version; it is introduced as the main component of the BFG 10000, which appears as a massive interplanetary cannon mounted on Mars's moon, Phobos, used by the Doom Slayer to shoot a hole into the surface of Mars.[7]

The BFG also makes an appearance in Avalanche Studios' Rage 2.