@starshaped @McNeely @sarajw FWIW, I just pushed an update to make some of the hints clearer. Now, when the hint relates to a number+color combo, instead of showing you a square and telling you only one combo can go there, it tells you exactly what the combo is, and then has you find the one place where that combo can go.

I think that inversion provides a much clearer path from hint to solution, and so it should hopefully be a lot more helpful both for finding the next move, and for helping players learn how to see it on their own.