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DOOM 3 Hints
BFG-9000
Damage: 200 from main blast and 5 per second from energy beams
Splash Damage: up to 100
Projectile Health: 5
Clip/Max Ammo: 4 / 32
First Found: Delta Labs Level 2 South
This gun, whose acronym stands for Big F***ing Gun (or Big Fun Gun to those of us too chicken to use foul language), is both the most powerful and most dangerous weapon ever. The longer you hold the attack key before releasing, the more powerful the blast that gets released. Also, as the blast travels toward its destination, it sends out small "seeker" beams that damage any hostiles in range (even if the main blast misses them entirely).
Be warned, though, that you can blow yourself to Kingdom Crumb if you hold down the attack key to build up the BFG's charge for too long (if it goes past level 4 on its charge meter). Another drawback is that the BFG projectile can be shot and triggered early by enemy weapons fire.