Digit Code

In Digit Code, each player in a two-player game creates a secret six-digit code, with three numbers above three numbers, with a digit 0-9 appearing at most twice and not adjacent to one another. The letters A-Y are used to indicate number segments in a column or in a row, or within a particular digit. Players take turns asking each other questions of the following four types:

How many spaces in row ? or column ? are filled?
Is the number ? even or odd?
Looking at the adjacent numbers ? and ??, which one is larger?
Is the segment at row ? and column ?? filled?

Each player must ask all four question types before they can repeat a question type. On a turn, a player can give a six-digit number instead of a question. If they have guessed all six numbers correctly, they win; if not, the opponent says "Wrong", and the game continues. If a player guesses incorrectly twice, they lose.

With three or more players, one player creates a six-digit number that the other players race to deduce first, with the players asking questions in turn. Once again, if a player guesses incorrectly twice, they are out of the game.