It's the Guess Who? game - the original guessing game! This Guess Who? Each player chooses a mystery character and then using yes or no questions, they try to figure out the other player s mystery character. When they think they know who their opponent's mystery character is, players make a guess. If the guess is wrong, that player loses the game! Players can also challenge opponents to a series of games in the Championship Series, where the first player to win 5 games is the Guess Who? champion.