Nonogram Solver
- Information about Nonogram logic puzzles and how to solve them, plus examples of two on-line solvers, software, and links.
- http://www.comp.lancs.ac.uk/computing/users/ss/nonogram/

Conceptis Puzzles
- Creator and supplier of picture-forming logic puzzles. Contains online games and those for sale from Japan.
- http://www.conceptispuzzles.com/

Solving Paint-by-Numbers Puzzles with Integer Programming
- Article and instructions on solving puzzles.
- http://www.oberlin.edu/math/faculty/bosch/pbn-page.html

Paint by Numbers
- Offers two color puzzles available to print out or solve online.
- http://www.blindchicken.com/~ali/games/puzzles.html