Discoverability of "Victorian" interactions

[benjohnbarnes]

I was enjoying JSdares with my son last night. I'm very impressed, thanks! I started reading your short essay about it today, and realised there's lots of amazing stuff we missed in the UI while using it for about an hour!

• Mousing over the canvas and seeing the code highlight is amazing! We didn't know about it :-(
• Mousing on the code and seeing the canvas is amazing! We didn't know about that either :-(

Could this be made more discoverable, or be explicitly explained? Or, how about: have a dare that introduces the concept! This is an approach often used in games to teach you the interface. Something like:

"Mouse over the robot's tracks to find the line of code that goes through the green square, then add a comment to it."