Nice. Summle seems a bit easier to get into than https://nerdlegame.com
You can burn yourself early by doing an incorrect equation, and the only way to finish is to reset by refreshing the page.
So it is more of a learning game then a competitive/iterative game.
You could do it all in your head (or in another program/on paper) to do it the best way on your first try, but you can't fix mistakes once trying something teaches you something.