[Scaevolus]

Mastermind? :-)

[jjnoakes]

I think similar to wordle, but the defender can change the word being guessed at will as long as they don't invalidate any previous response.

[GrantZvolsky]

Yes, this is it. I came up with the idea while trying to figure out whether any challenge is solvable in four guesses.

[FabHK]

What makes the strategy a bit different from Mastermind is that you have so many more letters than colours.