This is a bonus puzzle, not part of the main Activity Workshop library but part of a commercially available game. As part of Frogwares' game "Sherlock Holmes: Mystery of the Mummy" there is a Nonogram puzzle, which according to the forums is particularly tricky for first-timers. Add to that the fact that the puzzle has a time limit, and it becomes even harder. Hence we have provided here an opportunity to practice that puzzle at one's leisure before risking life and limb in the game itself. If you don't understand the rules, see the Nonograms tutorial and the worked-through example.
Hopefully this is useful for people struggling with the game. Enjoy!
Hint: The columns with 31 as the clue make a good place to start! The rows of 26 are also pretty useful.
Don't forget to try out the other puzzles here in the Activity Workshop, if you haven't done so already!