subpuzzle

plural subpuzzles

1. A puzzle making up part of a larger puzzle.

   The tangram portion defined by the edges traced during the first and second encounter constitutes a subpuzzle.

   1972, B. Meltzer, Donald Michie, Machine Intelligence, volume 7, page 213

   1 more example

   The three-dimensional problem consisted of three subpuzzles or sets of pieces; the three subpuzzles (hereafter called parts) could be assembled into one large block.

   1968, American Psychological Association, Proceedings of the Annual Meeting, volume 3, page 411