Primal Hunt is just an expansion of AVP2. Graphics, sound and all that is the same. The only thing that changed is the story and a few weapons where added. The story is that there is a ancient artifact that has the abilty to do something to aliens ( i think to keep them at bay). As a human you want the artifact for your own purposes, as a predator you want the artifact to control the alien hive and as an alien you want to destroy the artifact so no one can do harm to your nest with it. The new weapons and equipment are: Humans= dual pistols, sentry guns, turrent gun, 360 degree motion tracker, Predators= energy feltch and self destruct, Alien= Predaliens get the headbite move. Multiplayer in this game is awsome since now the predaliens can heal themselves and preds can self destruct to kill enemies around them, sentry gun ruin game balance because they kill you quickly and there is no limit to how many r put on the map.