How to triumph over larger Nonogram puzzles.

A followup to the introduction to Nonogram puzzles (   • What is a Nonogram? An introduction to a f...  ), in this one, Professor Wiseguy takes his vorpal sword in hand and solves (none too quickly) a 20x20 puzzle. Along the way, he attempts to provide some tips and tricks for taking the guesswork out of this spiffy game.