At Battle School, Ender plays an open-ended adventure game that seems to have no clear point/ultimate goal. Ender is often frustrated by the game, and finds himself stuck at a particular point. He tries various methods to beat the level. He eventually manages to defeat a character (the giant) through violence. The violent act fueled by frustration and rage, and is somewhat out of character for Ender -- or, at least, out of what he hopes is his character. He fears the dark, impulsive side of himself (the same side that, earlier in the novel, led him to brutally beat a bully), but it is that side that allows him to advance to the next level. His character climbs a beanstalk (like in Jack and the Beanstalk), and he explores the giant's palace. Eventually, he defeats a snake (again, though violence), and finds himself face to face with a mirror. At this point, Ender is so closely identified with the character in the game that he feels as if he is actually having this experience himself. It is that closeness that makes the mirror's reflection more disturbing. In the mirror, Ender sees not his own face but the face of his brother, Peter. Peter is cold, manipulative, violent, and cruel, and the mirror's reflection is a representation of Ender's greatest fear: that in the end, he will be just like his brother.