1. The outlines of the differently-colored regions of a picture, with each region marked with a number corresponding to some color of paint, intended to produce a painting, similar to color by numbers.

2. A type of logic puzzle imported from Japan in the early 1990s by GAMES Magazine and other publications. In this type of puzzle, a small bitmap image is encoded by presenting the contents of each row and each column as a list of the lengths of the groups of consecutive black pixels in that row or column. Each group is separated from adjacent groups in that row or column by at least one white pixel. There may or may not be white pixels at the ends of the rows and columns.

These puzzles are readily adaptable to computer form. A web site devoted to these puzzles is http://www02.so-net.ne.jp/~kajitani/cgi-bin/pbn.cgi/index.html

Here's a sample paint by numbers puzzle:

        2 1 1 2
        2 2 2 2 
    4 6 2 1 1 1 4 3
  4 . . . . . . . .
2 2 . . . . . . . .
2 2 . . . . . . . .
  8 . . . . . . . .
  8 . . . . . . . .
  2 . . . . . . . .
  2 . . . . . . . .
  4 . . . . . . . .

Answer