For the maze solving craving in all of us. You can drill down to any of 1,000,000,000 mazes on this site. That’s right, one billion (with a b). For me, the resulting link downloaded a file without a pdf extension, but adding it made it come right up. Most of the time, it should just pop up in your browser if you have Acrobat installed.
If they ever do a site with one billion sudoku puzzles, then I would be in trouble.