Polyup is a free and open computational thinking playground where students can experiment with numbers and functions. Students will “mod”, or modify, a variety of expressions, equations, and algorithms to solve mathematical puzzles and discover the beauty of math in a visual environment. With self-paced activities geared towards 3-5th, 6-8th, and 9-12th grades, Polyup works great as a supplement to any math classroom. It is available on the web and runs on any device, including Chromebooks, phones, and tablets.