You try to securely transmit codes to your teammates without the other team intercepting them. You have to give clues that are obvious to your side but completely vague to your opponents. It burns your brain in the best way possible as the hints get progressively weirder. Grab some snacks because you will be sitting here for a little while. Make sure you have a decent sized table for this one. It provides a nice balance of luck and strategy without feeling unfair. The rulebook is actually pretty solid so learning it is not a headache.