On the weapons side, the expansion will give you access to the double-barreled shotgun, which holds a special place in the hearts of many old-school DOOM fans. Although it uses standard shotgun shells, it's a unique weapon that once belonged to Sarge, which you'll come across fairly early in the game. There's another new weapon that might raise a few eyebrows: the Ionized Plasma Levitator, also called the Grabber. It performs a function similar to that of Half-Life 2's gravity gun, taking advantage of DOOM 3's advanced physics system to let you pick up objects, move them around, and even use them as weapons. If you've played Half-Life 2, you'll find a few differences: you can grab projectiles from enemies and fling them back, or even pick up small enemies and toss them at each other.