Rockstar has just launched a new Grand Theft Auto IV trailer, titled “Liberty City Gun Club.” Continue reading to watch. Click here for first picture in gallery.

The way the player moves is controlled by Euphoria, instead of pre-written animations, enabling character movements to be more realistic. Rockstar Games announced that Euphoria would be used in future Rockstar titles. The Euphoria engine enables NPCs to react in a realistic way to the player’s actions