There are three puzzles here. Puzzle 1 is "easy", puzzle 2 is "medium", and puzzle 3 is "hard". The goal is to match up the sides of the puzzle so that equivalent expressions are along each side. Print out the puzzles, cut out the squares, and have fun!
I've included two different versions of each puzzle: one with letters and one without. There is an answer key included that shows the proper ordering of the letters.
This would be appropriate for middle school math, but I've found it works great for reviewing integers in Algebra 1.
I've checked and double-checked the numbers, but if you find an error, please let me know and I can send you a corrected version.