Educational games are a creative, enjoyable way for students to learn about technical concepts. We present Entanglion, a board game that aims to introduce the fundamental concepts of quantum computing – a highly technical domain – to students and enthusiasts of all ages. We describe our iterative design process and feedback from evaluations we conducted with students and professionals. Our playtesters gave positive feedback on our game, indicating it was engaging while simultaneously educational. We discuss a number of lessons we learned from our experience designing and evaluating a pedagogical game for a highly technical subject.