- Conceptis Puzzles - Creator and supplier of picture-forming logic puzzles. Contains online games and those for sale from Japan.
- Nonogram Solver - Information about Nonogram logic puzzles and how to solve them, plus examples of two on-line solvers, software, and links.
- Paint by Numbers - Offers two color puzzles available to print out or solve online.
- Solving Paint-by-Numbers Puzzles with Integer Programming - Article and instructions on solving puzzles.