Numer0n Numer0n is a number guessing game, which is played by 2-players. Each player has 10 cards (0, 1, .., 9), chooses the 3 of them, and places them face down in a row. On your turn, you guess the opponent's cards. If the answer is wrong, you get the hint: the hit and blow numbers. hit: The number of the cards both of which numbers and locatons are correct. blow: The number of the cards whose numbers are correct, but whose locations are wrong. If you can get the opponent's true cards (= 3 hits) before the opponent does, you win! Example The cards of the player A are "0", "4", and "7". The answer of the player B is "417". Then, the result is: 1 hit ("7") and 1 blow ("4"). Reference wikipedia_Numer0n