But if you need to guess a number, and you know it's _5_34, having three correct digits don't help you figure it out.
So I made some variants where guessed values do help you figure out the correct answer.
In rationerdle (https://zck.org/numberdle/?variant=rationerdle), you have to guess a rational number x/y, where both x and y are between 1 and 99, inclusive. It displays the rational number you actually guessed, and whether x and y separately are too high or too low.
In factordle (https://zck.org/numberdle/?variant=factordle), the player has to guess the factors of a target number.
In formuladle (https://zck.org/numberdle/?variant=formuladle), there is a graphed straight line, and the player has to guess the mx+b formula that graphs that line.
I would like to make more, but didn't have any other great ideas when I ran out of interest.