How to link the heart, key, and arrow together.  From Pathfinder, 1930.

A dot-to-dot puzzle or a night of alphabetic stars?  Why can't it be both?  From Think-and-Do Book to Accompany More Friends and Neighbours, 1940.

From The Children's Newspaper, 1958.

From the Bombay Sunday Chronicle, 1935.

From Reading Readiness by M. Lucile Harrison, 1936.

From The Children's Newspaper, 1927.

From the Massachusetts Society for the Prevention of Cruelty to Animals's Our Dumb Animals, 1959.

Fill in the shapes that are not animal names, so as to reveal a silhouette of a creature once considered mythological.  From the Bombay Sunday Chronicle, 1938.

From The Children's Newspaper, 1939.

From Punch, 1910.

From Taylor Magazine, 1969.

From UFO Brigantia, 1989.

From Susquehanna's 1909 yearbook.

You've heard of the puzzle of life.  Here's one piece, though it isn't a corner piece and so might not do you a lot of good.  From St. Andrews Presbyterian's1986 yearbook.

This Book is a Cactus turned out to be the most difficult project we've ever tackled.  We wanted to recreate the very first computer game we programmed, from back in the 1980s—the Tamagotchi precursor of a virtual flower—but this time in book form.  What we ended up with is a combination choose-your-own-adventure and puzzle book; it's a surrealistic virtual reality experience you hold in your hands, as the book is also a cactus that you attempt to keep alive.  A hybrid cactus-book.  Each page is like a square on a game board.  You make decisions and solve riddles, and your choices/answers lead to different squares.  Math puzzles, word puzzles, logic puzzles, and riddles appear at intervals within the fractal storyline.