Conceptis logic puzzles - Have fun, get smart!
Nonstop fun with the world's best logic puzzles: Sudoku and Sudoku variants, Pic-a-Pix, Link-a-Pix and other logic puzzles updated weekly. Play online and print on paper.
https://www.conceptispuzzles.com/index.aspx
griddlers.com: The Best Search Links on the Net
Entertainment, Games, Puzzles, Brain Teasers, Nonograms - Elite Japan Crossword. Downloadable software for solving paint by numbers puzzles in many formats, including plain black and white bitmap files.
http://www.griddlers.com/