I liked the structure of the guide. However pairing the memory tables while mentally executing the code line-by-line got confusing for me. (Especially because the code was offscreen because the tables take up vertical space)

I'd love to see this kind of explanation done in a non-text medium. For example, a slideshow or interactive webpage (ex: http://www.redblobgames.com/pathfinding/a-star/introduction....)