More interactive calls to action

[acobster]

Instead of just reading a bunch of text telling them "Do this thing, then do this other thing, then..." the first page should call out exactly what action to take, e.g. with a hovering arrow or some other visual queue.

Subsequent modes should "unlock" one at a time, like game levels. For example, the first time you visit the site, you shouldn't be able to skip from mystery mode directly to explainer mode.