Puzzle about simple machines. Here is a Science theme unit crossword puzzle about simple machines. Supports students' classrooms learning about: levers, inclined planes, wedges, wheels and axles, screws, and pulleys. Challenge learners by engaging them in friendly competition to see who can be the first to solve this free, downloadable, printable puzzle. Also, consider using this puzzle to support both the digital and Google classroom. Consider extension and cross curricular activities to consolidate learning. Differentiate instruction as required.