The best game ever. This game's graphics, storyline, and diverse characters will blow your mind. It does, however, have some flaws. Humans are impaled on steel pikes by an alien race called the Geth. During these cutscenes, little blood is shown, and the are not impaling them for fun, but because the impaled humans become an entirely different species that the Geth uses for soldiers. Violence is a recurrent theme in this game, for good reason. Commander Shepard, your character, is a war commander. He is mostly attacked, and retaliates for self-defence. The blood of species that are not human is never red. The main enemy is the Geth, which appear to be more like a robot that a living species. However they have white blood, which is seen frequently, given that they are the main enemy. The Geth leader is of a different species, which is a species called Turians, of which one of your squad-mates is. His name is Saren, and he has purple blood, which is seen a large quantity only once (the final fight, when Saren is impaled with a piece of shattered glass, only to shed his skin, and reveal that he is part robot, and is therefore still alive) This game is based around violence and earns its "M" rating more than some others, but is still relatively mild. A good game, I strongly suggest you try.