Review Matrices and Cryptography with this Jeopardy - Style review game! My students love playing this! Click on the desired category. To see the answer, click on the category value in the top right corner of the question slide. To go back to the main slide, click on the category name in the top left corner of the answer slide. Use the infinitely cloned 'X' in the bottom right corner of the main slide to keep track of which categories have already been visited.