yup; it's on github
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Guess the letter!

See how well you can figure out what comes next. It's always a letter of the English alphabet (case insensitive) or a space, a comma, an apostrophe, or a period. That's 30 possibilities for every character. Just start typing! The correct text appears here:

 

What you enter will appear here:

 

[incomplete] accuracy: [unknown]; perplexity: [unknown]

(0 of characters; 0 correct) (This is passage 1 of 20.)

No keyboard? Select here: (Then zoom out.)