This is a great idea. I am sure the code is pretty demanding too. My humble feedback that after a while, you get a bit lost visually. Maybe having a way to reset a square to its original position? Or backtrack? Not sure. Other than that, great effort!!
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I am following the free tutorial over at DragonRuby School. There are some instructions to type <kbd>:</kbd> and then `$dragon.gridlines!`. However, that does not work. What am I missing? If I type ` to bring up the console, that doesn't work there either.