"Resurrection of Evil improved a lot upon the previous release of Doom 3. Besides the artifact, the other new weapons include the double barrel shotgun and the gravity cannon. The double barrel shotgun may only be able to carry two rounds at a time, but it packs with one hell of a punch. Don’t expect it to be too deadly from long ranges, but if you’re within a reasonable distance almost anything will succumb to its tremendous force. Having a highly interactive environment is essential to a first person shooter nowadays, so id Software introduced their gravity cannon to show off how your surroundings can be affected. Similar to the gravity gun in Half Life 2, this gravity cannon can lift up objects such as crates, explosive barrels, and even corpses. While it isn’t used too much to help your exploration, it can be a very powerful weapon if used correctly. By taking hold of incoming projectiles from enemies, you can launch them back at high velocities and make them pay for messing with you. Some of the smaller enemies can even be sucked in by the gun’s force, which will kill them instantly. Upgrading the arsenal is a must for any expansion set, and Resurrection of Evil manages to do so effectively."