These difficult secret message puzzles (or Cryptograms) are great for teaching problem solving that helps in math, science, and computer programming. And they’re super fun, too! These 100 puzzles have only a single letter clue entered in to start kids off. Kids will need to use their knowledge about common letter combinations and words to solve the riddle. They'll need to work hard to figure out how to break the code! The PDF packet includes color, black and white, letter, and A4 (international) versions of all the puzzles, and there's an answer key at the back.

Printed pages: 400