string of pearls
n.— «A string of pearls structure is a linked series of worlds structures connected by plot points or tasks that the player must accomplish to move forward in the narrative. As defined earlier, a worlds structure lets the user explore a location.» —by Timothy Garrand Writing for Multimedia Dec., 1996. (source: Double-Tongued Dictionary)
Further reading
There are eight major planets, but more than a million minor ones, including asteroids. If you discover one, you get the honor of naming it. The Dictionary of Minor Planet Names includes minor planets named for rock bands, jazz musicians, poets, and...
If you reeeeeeeeeally want to emphasize something in writing, you can engage in what linguists call expressive lengthening, or making a word longer by repeating letters. It’s an example of paralinguistic restitution — rendering in text...