2444. Puzzles vary very much. One of the simplest that we know is this: -

Take away half of thirteen, and let eight remain.

Write XIII on a slate, or on a piece of paper-rub out the lower half of the figures, and VIII will remain.

What are termed "practical puzzles" are cut out of wood, cardboard, ivory, etc., and may be purchased at the toy-shops. (See 3234.)