1. Would be nice to have some sort of 'hint' or 'solve' button.
2. Since you have the copy regarding how it's a work in progress, I'd suggest throwing a link to the github issues page so it's easy to submit bug reports and whatnot.
3. I like it. Really aesthetically pleasing to use and each level is such a small incremental step forward I think that even the most timid of noobs would get a kick out of using it.
Did you see the CSS documentation on the right sidebar? It took me a while to notice it was there.
I couldn't for the life of me 'unstick' myself from my initial answer. The hint could have kinda slapped my brain and jolted the more concise answer outta me.
Really minor detail I know, but with a lot of these online lesson helpers people do like to have the answer available to them.
Apparently "plate pickle, bento pickle" (or reverse order) isn't correct. Would love to see a hint/solution manual.