[allenu]

This is very cool. Nice job on this! I like how slick the UI feels when I'm scrolling up and down the tutorial steps.

One quick piece of feedback that I saw right away: Clicking on the next step on the left and then seeing the video update on the right is distracting, so I ended up not even reading the text on the left after a while.

Perhaps you could show "subway stops" on the left to indicate which step you are and how many there are in total, and then have the instruction text above or below the video? The way it works now, your eyes have to dart back and forth from left to right to read the text and then watch the video.

Anyway, best of luck with this.