This is great, definitely going to be using this to practice!

One note: It might be useful to keep the "undo" prompt when the user messes up after the first two prompted lessons for a clear recovery path.

Thank you for making this!

oh man this is great. thank you!

Cool, a small ux issue I noticed is that the grid cells are not clickable as a whole.

I did the first challenge or exercise, but I was honestly a little surprised that Vim motions aren't able to be used to choose the next exercise(s) in the sidebar that becomes visible. That could potentially be something that the player unlocks later on as well.

For all of the ciw examples, ce is easier since the cursor is at the first letter of the word.

Where dw works, this game teaches vlllld instead, which is a bad habit to teach.

Ctrl+A increments the first number after the cursor, which is easier than, say, f6r7 in cases where they do the same thing. Similarly, Ctrl+X decrements.

t:t: is weird when fY is much easier.

The Vim simulator has a minor difference compared to real Vim:

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Start on line one and do CTRL-V then j then CTRL-A. Real Vim would increment both. The simulator only increments the one under the cursor.