The combat system in Mass Effect 3 has been changed and refined. In particular, the cover system has been improved, there are more options for moving around the battlefield and scoring instant melee kills, more conventional grenades are available and an improved artificial intelligence is introduced. A four player multiplayer co-op mode is also available in game. Gameplay in Mass Effect 3 is influenced by decisions made in Mass Effect and Mass Effect 2, for players who have completed those games. It was nominated for five awards at the 2012 Spike Video Game Awards and it won Best RPG of 2012.