As the game proceeds, flashbacks occur showing events in Harris and Klebold's lives which may have caused them to commit murder; real life events are compressed into the game's timeframe for narrative purposes. Much of the plot is constructed around the events precisely as they are believed to have occurred; lines of the gunmen's dialogue are often lifted verbatim from their writings or from their own home videos of each other. In contrast to the 16-bit graphics are digitized photographs from the shooting or full voice samples from news reports; photos of the school are used as backdrops during battle scenes.