[blenderob]

Wow! The copyright of zone.el goes back to 2000. But this is the first time I hear about it! How did you find this gem?

[PessimalDecimal]

It got mentioned briefly in an article in Mickey Petersen's excellent Mastering Emacs blog.

[LukeShu]

I know the trendy thing is to hide the menu-bar, but it's great for discoverability. Tools→Games→Zone Out