Chapters

Note that chapters can exist separate of maps/levels and span a variable number of them. The chapters are usually announced in one manner or another, with either chapter name, number or both. Chapters are not always named "chapters" either (especially in eastern [e.g. Japanese] products where they seem to love using words somewhat related to the theme intead).

Superficially this is a sign that the game is linear and story-driven, but not required to be either.

See also: mission-based