We study the algorithmic complexity of the cooperative card game Hanabi. A feature of Hanabi is that players can see other players’ cards, but not their own, and exchange information through hints. Even in the model with one player who has full information about the deck, Hanabi remains NP-hard. We found the minimal parameters of the game that preserve NP-hardness. If these parameters are further reduced, the game turns out to be solvable in polynomial time.
A. A. Onorpienko (Fri,) studied this question.