Vim text editor game teaches you keyboard shortcuts with ice cream delivery

If you find yourself editing text at the Linux command prompt, you've probably either used nano, which is simplest, or the more powerful but difficult-to-master Vim. In Vim, for example, even moving the cursor up, down, left, and right is less than straightforward. How about an ice cream-themed game to teach you all the "Vim motions" (keyboard shortcuts) you need to become a master?