Learning mathematics is challenging. It requires discipline, logic, precision, perseverance, and accuracy. It can also be fun. When mathematics is set in a context that inspires students to want to solve interesting problems, students will have an intrinsic desire to learn the necessary skills to accomplish a specific goal. The game of Crypto! was designed to introduce middle school students to matrices in the context of decrypting a secret message. In so doing, the concepts of a matrix, rows, elements, equivalent matrices, inverse matrices, identity matrices, matrix multiplication, and solving matrix equations will be touched on. The game can be played with or without a graphing calculator, depending on the learning goals. It should be explored after students have a basic understanding of algebra. (Contains 3 figures.)