Guess Who — two players, one PIN

The yes-or-no deduction game, played live on two phones. You each pick a character in secret, then take turns asking a question the other has to answer honestly — glasses, hat, beard — and cross off everyone the answer rules out. First to name the rival's character wins. The whole skill is in the question: asking about a feature half the board has splits it cleanly in two, and asking about a rare one usually wastes a turn. One of you hosts and shares the PIN, and only the host needs an account.