It is not uncommon for visual novels to have morality systems. A well-known example is the 2005 title "School Days", an animated visual novel that Kotaku describes as going well beyond the usual "black and white choice systems" (referring to video games such as "Mass Effect", "Fallout 3" and "BioShock") where you "pick a side and stick with it" while leaving "the expansive middle area between unexplored." "School Days" instead encourages players to explore the grey, neutral middle-ground in order to view the more interesting, "bad" endings.