Finding a Winning Strategy for Wordle is NP-complete

In this paper, we give a formal definition of the popular word-guessing game Wordle. We show that, in general, determining if a given Wordle instance admits a winning strategy is NP-complete. We also show that given a Wordle instance of size $N$, a winning strategy that uses $g$ guesses in the worst case (if any) can be found in time $N^{O(g)}$.

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