Can it be fixed by just changing the icon for menu—it could even just say MENU? This might actually make the below moot.
If it’s possible to organize the UI better that makes sense.
I don’t know web-dev enough to tell what’s reasonable but, alternatively
core.online-go.com with “go to full site” button
If it uses similar layout as the main one’s, I’m guessing it’s not that hard—once familiarizing oneself with it—to move to the main site. A person with an ancient computer would stay on it.
teach.online-go.com core + teaching tools
(Would it update semi-automatically when “core” updates?)