"Halo 2" is a science fiction first-person shooter based mostly on foot but with vehicle combat sections. "Halo 2" has many features that were not in the original Halo. In Halo 2 players have the option to use two weapons at once, called dual wielding. This allowes the player much more firepower but does not allow the throwing of grenades. The player can hold up to two weapons at once or three when dual wielding. Weapons range from normal human weapons such as pistols and shotguns up to heavy weapons like rocket launchers and sniper rifles. The player can also carry alien weapons like "plasma rifles" and "needlers".