Press space or right arrow to move forward, and left arrow to move back. You can turn the music on and off. I also made it so you can continue without answering a question, but I recommend you take each self-test. I created this tutorial for beginners, but you will need to know some basic math before you start. Feel free to ask questions in the comments.
Thanks a lot to @MathMathMath for the music and some inspiration. The idea of a trigonometry tutorial was mine, though. - .... .- -. -.- ... / ..-. --- .-. / .-. . .- -.. .. -. --. /