Metal Slug
"Metal Slug" games typically have 6 levels. The exceptions are "Metal Slug 3", "Metal Slug 5" and "Metal Slug 6", which have 5, and "Metal Slug 7", which has 7. In the Western arcade and console versions, the game would have the blood censored, showing white sweat instead of blood in its place. However, there is a code to disable this censor within the BIOS of the Neo-Geo hardware both on the arcade and home ports respectively.